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Sunny Start Saturday - Then Showers
Last Complete Site Update: 9/04 - 3:41 PM
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"By all these lovely tokens, September days are here.
With summer's best of weather and autumn's best of cheer."
- Helen Hunt Jackson
Today’s Weather at a Glance
Updated Every Morning and as Needed Through the Day
(Averages Across Southern NH)
80Degrees
High Temperature
0%
Probability of Precipitation - Daytime
57Degrees
Low Temperature
0%
Probability of Precipitation - Nighttime
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Today in Peterborough, NH at a Glance
Today in Nashua, NH at a Glance
Your Daily Forecast - Three Days at a Time
No Active Advisories
None
Monday/Monday Night - September 7 - Labor day
Nashua - East
Sunny, with a high near 76.
Mostly clear, with a low around 55.
Peterborough - Central/West
Tuesday/Tuesday Night - September 8
Nashua - East
Get your Forecast from RichLefko Lite
Mostly sunny, with a high near 77.
Partly cloudy, with a low around 54.
Peterborough - Central/West
Mostly sunny, with a high near 73.
Partly cloudy, with a low around 52.
Wednesday/Wednesday Night - September 9
Nashua - East
Get your forecast from RichLefko Lite
Mostly cloudy, with a high near 75.
A 50 percent chance of showers. Mostly cloudy, with a low around 62.
Peterborough - Central/West
Mostly cloudy, with a high near 72.
A 50 percent chance of showers. Mostly cloudy, with a low around 60.
Thursday/Thursday Night - September 10
Nashua - East
Get your forecast from RichLefko Lite
Mostly sunny, with a high near 78.
Partly cloudy, with a low around 55.
Peterborough - Central/West
Partly sunny, with a high near 74.
Friday/Friday Night - September 4
Nashua - East
Mostly cloudy, then gradually becoming clear, with a low around 60. Northwest wind around 5 mph.
Peterborough - Central/West
Mostly cloudy, then gradually becoming clear, with a low around 56. Northwest wind around 5 mph becoming calm in the evening
Saturday/Saturday Night - September 5
Nashua - East
Showers likely, mainly after 4pm. Increasing clouds, with a high near 73. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Calm wind becoming north around 5 mph. New precipitation amounts of less than a tenth of an inch possible.
Peterborough - Central/West
A chance of showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 72. Northeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 50. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday/Sunday Night - September 6
Nashua - East
Sunny, with a high near 70. North wind around 5 mph.
Mostly clear, with a low around 50. Calm wind becoming northwest around 5 mph.
Peterborough - Central/West
Sunny, with a high near 68. Calm wind becoming north around 5 mph in the afternoon.
Mostly clear, with a low around 48. Calm wind.
Current Weather Readings in Peterborough, NH
Time of the readings below: 4 Sep 2026 11:53 PM
(FYI: The number in parentheses is the change in the last hour)
(Note: My weather Instruments are Offline from Midnight Wednesday to 7AM Thursday for system Back ups.)
Current Temperature:
63.8°F (1.3)
High Temperature:
78.5 at 2:44 PM
Low Temperature:
57.5 at 6:45 AM
Precipitation Today:
0.00 inches
Current Dewpoint:
58.5°F (-0.0)
Highest Heat Index Reading:
78.5 at 2:44 PM
Current Windspeed:
0 MPH (0)
Barometric Trend:
Falling Slowly
Hours of Daylight Today:
12:59
Link to my Active Weather Instruments
Information for New England
Seven Day Temperature Outlook - Manchester NH & Southern New England
Current Northeast Radar
Expected Temperature Range
Health - The Five Day Allergy & Mosquito Outlook for Southern NH
Rich's Weather Discussion
New Hampshire/North Briefing
Massachusetts/South Briefing
At this moment: 9/04 - 3:42 PM
Notes from Rich:
What is the 'Regular’ Schedule.
Weekdays: Morning updates each day before 8AM, Evening Updates before 7PM.
On Weekends: Perhaps a bit later. I like to sleep in.
Every Thursday morning I post the daily forecast through the weekend.
Upcoming Site Update Schedule Changes:
I will be taking some time off starting this weekend - 9/05. This site will NOT be updated after 9/5, but updates will be returning to the regular update schedule around 9/12-13. My weather instrument readings will continue to be live and available through this period.
In the meantime, you can grab a daily forecast, and the forecast for most of the week ahead here at RichLefko.com/Lite. Give it a shot. I created this site so I could keep you all updated weather-wise when I am on vacation. I also posted the weather into next Thursday in the dailies above!
I see a couple of thunderstorms popping up in the north, in Maine, and in some coastal areas up there. We should remain dry and quiet here in Southern NH tonight. A sunny start to Saturday, then a chance of showers arrives by Saturday afternoon into Saturday evening. Then much cooler and dry through Labor day.
A few scattered showers and isolated thunderstorms are possible through early this evening, with another round of showers possible Saturday and Saturday night. Sunday through Tuesday morning should turn noticeably drier and more pleasant, although a few showers could accompany a weak front Tuesday. Another larger weather system may bring a period of rain during the middle to latter part of next week, but current guidance suggests it may move through too quickly to completely erase ongoing rainfall deficits.
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What information can you find on my site, and where is it?
The History Section has a lot of history to share, and I will be sharing video on this page from time to time. Updated every day with new weather history.
Find beach and hiking, and Ski information as well as travel info for the USA in the Travel and Leisure Section.
Find all Tropical Tracking/Hurricane information on the Tropics Page.
Find the current Drought Maps here. Now showing a map for each New England State.
Looking for Radar? Try the Radar Page.
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Note: When you move your cursor over an image, the image fades. Click on the image and that opens a lightbox view that expands the image and allows you to click through all of the images in a section.
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On this day in history:
On this day in 1886, Apache leader Geronimo surrendered to U.S. troops in Arizona, closing the book on nearly 30 years of armed conflict between his band and U.S. forces. He was the last Native American leader to formally surrender to the U.S. military, and his surrender is widely considered the end of the Indian Wars in the Southwest.
Latest site updates and additions:
08/17 - See the First look at Autumn Maps and info here
Find the August Almanac Here
Hurricane Season began on June 1st - Details and forecasts can be found here.
07/17 - Find the Mosquito Outlook in the Heath Section. Added Mosquito forecast for Nashua
05/01 - The Hampton Beach Report returns! Updated daily.
In the Health Section above, starting April 7, you will find the Allergy Forecasts for Southern NH.
You can find my weather Reading via Weather Underground here: Peterborough, NH Readings
Catch Weather News Headlines and links here.
I have updated Rain/Snowfall totals here.
Drought information updates every Other Thursday evening. Last update: 08/30 - Next Update: 09/15 (or thereabouts)
Weather Summaries and Full Area Forecast Discussions - North (Edited)
Summary - Northern New England - New Hampshire and Maine
Summary:
A few scattered showers and isolated thunderstorms are possible through early this evening, with another round of showers possible Saturday and Saturday night. Sunday through Tuesday morning should turn noticeably drier and more pleasant, although a few showers could accompany a weak front Tuesday. Another larger weather system may bring a period of rain during the middle to latter part of next week, but current guidance suggests it may move through too quickly to completely erase ongoing rainfall deficits.
Key Messages:
- Scattered showers and isolated storms are possible into early this evening, followed by another chance for showers Saturday and Saturday night.
- Drier conditions arrive Sunday through Tuesday morning. A return to more damp conditions is possible during the middle to latter part of the week.
What has changed since the last Forecast Update?
Chances for showers have been increased farther south toward the Maine coast this afternoon based on recent trends. No other changes were needed to the forecast.
What this means for you:
Expect a somewhat unsettled start to the weekend, especially across the mountains, western Maine, and New Hampshire. Saturday will be cooler, cloudier, and somewhat breezy, with temperatures mainly in the low to mid 70s, while some cloudier locations may remain in the 60s. Sunday through Tuesday morning should provide a stretch of drier weather with comfortable temperatures. Some southern New Hampshire locations could fall into the mid 40s Sunday night. The middle to latter part of next week could bring more widespread rain, but it may not be enough to fully reverse the recent dry pattern.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
Area Forecast Discussion, National Weather Service Gray ME, 236 PM EDT Fri Sep 4 2026
**WHAT HAS CHANGED**
Chances for showers have been increased farther south toward the Maine coast this afternoon based on recent trends. No other changes were needed to the forecast.
**KEY MESSAGES**
1. Scattered showers and isolated storms are possible into early this evening, followed by another chance for showers Saturday and Saturday night.
2. Drier conditions arrive Sunday through Tuesday morning. A return to more damp conditions is possible during the middle to latter part of the week.
**DISCUSSION**
**Key Message 1**
An upper-level low pressure system centered just to our north will slowly move eastward tonight and become nearly stationary near Nova Scotia through Saturday. Cyclonic flow, meaning air circulating around the upper low in a way that supports unsettled weather, along with smaller disturbances moving around the low, will bring scattered showers and isolated thunderstorms during the first part of the weekend.
The better chances for showers today will be around the mountains and western Maine, with a few showers possibly lingering in the mountains tonight. Fog should not be as widespread overnight into early Saturday because winds may remain just strong enough to limit fog formation. Patchy fog is still expected in the Connecticut, Pemigewasset, and Saco River valleys, where winds appear light enough for fog to develop.
On Saturday, clouds will increase during the morning and afternoon. The better chances for showers will shift toward the mountains and New Hampshire as a backdoor front moves through the region. A backdoor front is a boundary that moves into an area from the northeast rather than following the more typical west-to-east direction.
Temperatures will fall a few degrees, with most locations reaching the low to mid 70s. Some locations that remain cloudier could stay in the 60s. It will also be somewhat breezy, especially across western Maine, where north winds could produce gusts around 20 mph at times.
Another disturbance will drop south into northern New England Saturday night, potentially bringing a few additional showers to New Hampshire and the mountains. Because of this possibility, valley fog has not been included in the forecast for Saturday night.
**Key Message 2**
High pressure will arrive from the west Sunday morning. Predominantly northwest winds will continue through the day and remain breezy because of a tight pressure gradient just east of the area. A pressure gradient is simply the difference in air pressure across a given distance, with a stronger difference producing stronger winds.
Despite decreasing clouds, temperatures should be similar to Saturday, mainly in the low to mid 70s.
Sunday night, the high pressure system may never move directly overhead. This will keep some gradient wind across northern and eastern portions of the CWA, or County Warning Area. Although skies will clear, the continued wind may prevent the ground from cooling as efficiently overnight. Areas that do manage to cool more will generally be farther south and west. This could allow temperatures to fall into the mid 40s across parts of southern New Hampshire.
High pressure over the Great Lakes Monday will provide another pleasant day with dry weather. Temperatures will rise a few degrees as the air source shifts toward the west, with similar conditions expected Tuesday.
A weak cold front will move through northern New England Tuesday. A few showers could accompany the front, but rainfall should be limited and is not expected to make a significant improvement in the ongoing dry conditions.
**Middle to Latter Part of the Week**
Forecast guidance continues to show a larger weather system moving into the region during the middle to latter part of the week. Weather forecast ensembles, which are groups of model forecasts used to estimate the range of possible outcomes, show a likely probability of integrated vapor transport, or IVT, exceeding 500 kilograms per meter per second.
IVT measures the amount and movement of water vapor being transported through the atmosphere. Higher IVT values generally indicate a greater supply of atmospheric moisture available for rainfall.
The system appears likely to move through quickly rather than stall over New England. This pattern has been common with many of our weather systems this summer. Even so, the system may move through slowly enough to produce a beneficial wetting rain. However, current indications suggest the rainfall may be too limited to make a major dent in the existing rainfall deficits.
Weather Summaries and Full Area Forecast Discussions - South (Edited)
Summary - Southern New England - Massachusetts/Northern CT/Rhode Island
Summary:
A mostly dry and pleasant Labor Day Weekend is ahead for southern New England, with only an isolated shower chance Saturday afternoon. Sunday will bring a distinctly fall-like feel with cooler temperatures, lower humidity, and a crisp northerly breeze, followed by a return to more seasonable warmth for Labor Day and the middle of next week. The main concern for beachgoers will be an elevated risk for dangerous rip currents, especially Sunday into Labor Day.
Key Messages:
- Mostly dry and pleasant for the weekend outside of a chance for some isolated showers Saturday afternoon.
- Fall-like feel for Sunday, then more seasonable for Labor Day. A gradual warm-up throughout the week with continued dry weather through at least Wednesday or Thursday.
- Elevated risk for dangerous rip currents through the Holiday Weekend, especially Sunday into Labor Day.
What has changed since the last Forecast Update?
No significant changes to the forecast.
What this means for you
Most of the holiday weekend should be dry and comfortable. Saturday will be mild with a small chance of an isolated afternoon shower. Sunday will feel much more like early autumn, with highs in the upper 60s to low 70s and cooler nighttime temperatures. Warmer weather returns for Labor Day, with highs in the upper 70s, followed by upper 70s to lower 80s during the middle of next week. If you are heading to the beach, use extra caution because ocean conditions will remain hazardous even though the weather itself will be quiet.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
Area Forecast Discussion, National Weather Service Boston/Norton MA 248 PM EDT
Fri Sep 4 2026
**What has Changed**
No significant changes to the forecast.
**Key Messages**
Mostly dry and pleasant for the weekend outside of a chance for some isolated showers Saturday afternoon.
Fall-like feel for Sunday, then more seasonable for Labor Day. A gradual warm-up throughout the week with continued dry weather through at least Wednesday or Thursday.
Elevated risk for dangerous rip currents through the Holiday Weekend, especially Sunday into Labor Day.
**Discussion**
**Key Message 1, Mostly dry and pleasant for the weekend**
A broad cutoff low, meaning a low pressure system that has become separated from the main jet stream, will track into the Canadian Maritimes today and Saturday. Northerly winds will continue tonight before shifting more toward the north and northeast Saturday afternoon as the low continues to circulate.
Cooler air moving in aloft, combined with daytime heating, will help clouds develop Saturday afternoon. This could produce a few isolated showers, although most locations will remain dry. Atmospheric moisture will also decrease, with precipitable water, the total amount of moisture available in the atmosphere, falling below 1 inch.
Saturday highs will be somewhat cooler because of the northerly and northeasterly flow and cooler air aloft, especially across eastern Massachusetts. Temperatures around 2,500 feet above the ground are expected to be around 54 to 57 degrees over eastern Massachusetts, with the interior closer to 61 to 64 degrees. Temperatures around 5,000 feet may fall below 50 degrees Saturday, with this colder air more likely to become established Sunday.
Saturday night will turn cooler, with lows generally in the lower to middle 50s across southern New England.
**Key Message 2, Fall-like feel Sunday, then warmer next week**
Saturday night through the middle of next week looks fairly quiet, with little opportunity for rainfall.
The upper-level pattern features a broad ridge of higher pressure across the middle of the country, while a closed mid-level low remains centered over Nova Scotia Sunday afternoon. The ridge gradually flattens, allowing more west-to-east flow to develop along the coast by Tuesday. A trough, or dip in the upper-level jet stream, may then develop across the northeastern states late next week, potentially bringing the next opportunity for more active weather to southern New England.
At the surface, high pressure builds in from the northwest Sunday, with its origins in northern Canada. High pressure remains the dominant weather feature through most of the forecast period, resulting in a prolonged stretch of dry weather.
Temperatures aloft will be cooler Sunday because of the mid-level low east of New England. Temperatures around 2,500 feet will be only around 46 to 50 degrees. Daytime mixing, which allows air near the surface to mix with cooler air above, supports highs in the upper 60s to low 70s.
Sunday will feature a mix of sunshine and clouds, northerly winds, and dew points in the low 50s. Dew point measures the amount of moisture in the air, so these lower values will make the air feel noticeably drier and more comfortable. While winds will not be particularly strong, the combination of cooler temperatures and lower humidity will make Sunday feel crisp and very much like autumn.
Sunday night should allow for good radiational cooling, meaning temperatures can drop efficiently as heat escapes under generally clear skies and lighter winds. Forecast guidance supports lows in the upper 40s to low 50s for most of southern New England, while urban areas such as Boston may remain in the middle 50s.
If you are not ready for pumpkin spice weather just yet, warmer conditions return during the week. WAA, or warm air advection, means warmer air is being transported into the region by the wind. This will gradually push temperatures higher.
Temperatures around 2,500 feet will climb to around 57 to 64 degrees, supporting highs in the upper 70s for Labor Day, followed by upper 70s to lower 80s Tuesday through the middle of next week.
Humidity should remain tolerable as well, with dew points generally in the upper 50s to around 60 degrees. Labor Day itself looks quiet and dry, although there will be a high risk for rip currents along the ocean beaches.
**Key Message 3, Elevated risk for dangerous rip currents**
Persistent northeast winds, long-period ocean swell, and offshore seas of 4 to 7 feet will continue to support an elevated risk for dangerous rip currents through the Holiday Weekend. The greatest concern will be Sunday into Labor Day, especially along east-facing ocean beaches.
With otherwise quiet weather expected, anyone heading to the beach should remember that calm weather does not necessarily mean calm ocean conditions. Ocean currents can remain dangerous even when skies are sunny and winds are not particularly strong.
Check with local beach staff or lifeguards regarding current ocean conditions before entering the water.
Countdown to Autumn
Autumn Begins on: September 23, 2026 at 2:05 AM EDT
92Days18Hours28Mins13Secs
Five Day Daily Temperature Run - Peterborough, NH
Updated Every Morning
Normal Daily Averages
High Temperature: 72 Degrees - Low Temperature: 50 Degrees
(Tip: Place your cursor over the bar below to see the number)
Weather News/Headlines of Interest
Labor Day Weekend outlook: Nasty storms threaten to wreak havoc on outdoor plans, holiday traffic
Drenching severe storm train to shift southward in eastern US into Labor Day weekend
First fall storms to slam Pacific Northwest with heavy rain, potentially easing raging wildfires
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