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Chance of Showers & Thunderstorms Until Midnight
Patchy Fog Monday - Then Sunny
Last Complete Site Update: 8/23 - 4:25 PM
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"August was nearly over - the month of apples and falling stars, the last care-free month for the school children. The days were not hot, but sunny and limpidly clear -
the first sign of advancing autumn."
- Viktor Nekrasov
Today’s Weather at a Glance
Updated Every Morning and as Needed Through the Day
(Averages Across Southern NH)
74Degrees
High Temperature
60%
Probability of Precipitation - Daytime
57Degrees
Low Temperature
40%
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 - August 24
Nashua - East
Areas of fog before 9am. Otherwise, sunny, with a high near 81. Light southwest wind increasing to 5 to 10 mph in the morning.
Partly cloudy, with a low around 57. Southwest wind around 5 mph becoming calm.
Peterborough - Central/West
Patchy fog before 9am. Otherwise, sunny, with a high near 75. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Partly cloudy, with a low around 54. Calm wind.
Tuesday/Tuesday Night - August 25
Nashua - East
Sunny, with a high near 81. Light west wind increasing to 5 to 10 mph in the morning.
Mostly clear, with a low around 57.
Peterborough - Central/West
Mostly sunny, with a high near 76. West wind 5 to 10 mph.
Mostly clear, with a low around 53.
Wednesday/Wednesday Night - August 26
Nashua - East
Sunny, with a high near 84.
Mostly clear, with a low around 59.
Peterborough - Central/West
Sunny, with a high near 80.
Mostly clear, with a low around 57.
Thursday/Thursday Night - August 27
Nashua - East
Peterborough - Central/West
Friday/Friday Night - August 28
Nashua - East
Peterborough - Central/West
Saturday/Saturday Night - August 29
Nashua - East
Peterborough - Central/West
Sunday/Sunday Night - August 23
Nashua - East
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Patchy fog after 7pm. Otherwise, mostly cloudy, with a low around 58. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Peterborough - Central/West
A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Patchy dense fog. Otherwise, mostly cloudy, with a low around 57. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Current Weather Readings in Peterborough, NH
Time of the readings below: 23 Aug 2026 5:31 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:
69.9°F (0.5)
High Temperature:
70.1 at 5:12 PM
Low Temperature:
62.7 at 5:59 AM
Precipitation Today:
0.24 inches
Current Dewpoint:
68.1°F (0.5)
Highest Heat Index Reading:
70.1 at 5:12 PM
Current Windspeed:
0 MPH (0)
Barometric Trend:
Falling Slowly
Hours of Daylight Today:
13:32
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: 8/23 - 4:25 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:
The regular schedule continues.
We have close to 1/4" of rainfall in the gauge so far today. Looking at future radar would suggest we have another line of showers & storms coming through about 8PM tonight. Then quiet into Monday.
On Monday, the atmosphere will destabilize during the afternoon, producing some showers. These would be passing showers, and mostly in the mountains as it looks at the moment. Much of the day should be dry and mostly sunny, but check back here in the morning for updates.
An unsettled start to the week will bring scattered showers and thunderstorms this afternoon and evening, with a few stronger storms possible across southern and central New Hampshire. Monday remains somewhat unsettled, followed by drier and warmer weather Wednesday and Thursday. The next widespread rainfall opportunity arrives Thursday night into Friday, with a mostly dry weekend expected.
Hawaii needs to watch the forecast closely this weekend. While crews on the Big Island are still clearing washed-out roads and downed lines from Hurricane Lala, which dropped more than 3 feet of rain in spots last weekend, damaged about 100 homes and six bridges, cut power to more than 100,000 customers and left one woman dead, a developing system that will soon be named Tropical Storm Moke is building.
This system's closest pass to the Big Island is expected Sunday into Monday, which means right now is the time to prepare. With this storm, wind speeds won't be the headlines; rain will. Five to 15 inches are possible on the Big Island, especially over the mountains and eastern slopes, with 1 to 5 inches elsewhere in the chain. This could mean more life-threatening flash flooding and landslides.
Get prepared now, charge all your devices, and stay safe.
The Drought Info has been updated.
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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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On this day in history:
On this day in 1861, Confederate spy Rose O'Neal Greenhow was placed under house arrest in Washington by Allan Pinkerton after intelligence from her network aided the Southern victory at Bull Run.
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: 08/15 - Next Update: 08/31 (or thereabouts)
Weather Summaries and Full Area Forecast Discussions - North (Edited)
Summary - Northern New England - New Hampshire and Maine
Summary:
An unsettled start to the week will bring scattered showers and thunderstorms this afternoon and evening, with a few stronger storms possible across southern and central New Hampshire. Monday remains somewhat unsettled, followed by drier and warmer weather Wednesday and Thursday. The next widespread rainfall opportunity arrives Thursday night into Friday, with a mostly dry weekend expected.
Key Messages:
- An expansive upper low will lead to scattered showers and thunderstorms this afternoon and evening, with more isolated activity expected Monday.
- The next chance of widespread rain comes late in the week, bookended by periods of dry weather through midweek and over the weekend.
What has changed since the last Forecast Update?
No major changes were needed for this forecast package. Initial showers early this afternoon will continue moving east and weakening, while some thunderstorms develop later this afternoon and into the evening. A few of these storms could become strong to marginally severe over southern and central New Hampshire.
What this means for you:
Expect periods of showers and thunderstorms today, especially this afternoon and evening. A few storms could produce gusty winds, frequent lightning, and small hail, with the greatest risk for stronger storms across southern and central New Hampshire. Monday will bring additional clouds, showers, and a few thunderstorms, especially in the mountains. Tuesday through Thursday should trend drier and warmer before another round of potentially widespread rain arrives late Thursday into Friday.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Gray ME, 224 PM EDT
Sun Aug 23 2026**
**WHAT HAS CHANGED**
No major changes were needed for this forecast package. Initial showers early this afternoon will continue moving east and weakening, while some thunderstorms develop later this afternoon and into the evening. A few of these storms could become strong to marginally severe over southern and central New Hampshire.
**KEY MESSAGES**
1. An expansive upper low will lead to scattered showers and thunderstorms this afternoon and evening, with more isolated activity expected Monday.
2. The next chance of widespread rain comes late in the week, bookended by periods of dry weather through midweek and over the weekend.
**DISCUSSION**
**Key Message 1 Description**
An expansive closed upper low is currently located over southwestern Ontario and will gradually move into central Quebec by Monday afternoon. This weather pattern will keep conditions unsettled to start the new week.
An initial batch of rain showers continues moving east as a warm front lifts across New Hampshire. This activity should begin to diminish as it approaches western Maine and loses support from the upper levels of the atmosphere.
Some of the latest high-resolution weather models are suggesting a few modest breaks in the clouds behind the early showers, mainly across portions of western New Hampshire during the late afternoon.
Storms should continue over Vermont along a cold front that will approach the border around 8 PM EDT this evening. Most high-resolution models suggest these storms will weaken as they move east, partly because the time of day will be less favorable for maintaining thunderstorms. However, some models are still showing around 500 to 700 J/kg of MLCAPE, which is a measure of the amount of energy available to thunderstorms, along with plenty of 0 to 6 kilometer wind shear in the 40 to 50 knot range. Wind shear describes how much wind speed and direction change with height, which can help storms become stronger and more organized.
While a few isolated storms will be possible ahead of the front, the best chance for a strong to marginally severe storm or two appears to be between 6 PM and 11 PM EDT over southern or central New Hampshire. Gusty winds, frequent lightning, and small hail will be the main threats.
Rain chances will diminish overnight, but another round of widespread fog is likely. With the atmosphere remaining under cyclonic flow aloft, meaning winds circulating around an upper-level low pressure system, more clouds and showers or thunderstorms are possible Monday, especially over the mountains. Storm coverage and atmospheric instability will be more limited than today, but wind shear could still support a stronger storm or two depending on how conditions develop.
**Key Message 2 Description**
An upper-level low will continue slowly moving through Quebec Tuesday, leaving the region under the influence of the upper-level trough for one more day. This should bring mostly cloudy conditions and a few showers to the mountains, with high temperatures in the low to mid 70s.
Areas south of the mountains should see more sunshine, but northwesterly winds bringing cooler air into the region will limit high temperatures to the upper 70s to low 80s. Downslope winds should also reduce the chance of precipitation in these areas.
Clearing skies and calm winds Tuesday night will allow temperatures to fall into the 50s.
Another trough approaches later in the week, but a brief area of high pressure and upper-level ridging will bring drier weather and a warming trend Wednesday through most of Thursday. Wednesday should remain comfortable, with high temperatures just a few degrees warmer than Tuesday.
Continued southwesterly winds Thursday will make conditions feel somewhat more humid as dewpoints climb into the mid 60s, with temperatures generally in the 80s.
Thursday night into Friday appears to be the next best opportunity for widespread precipitation as a broad trough pushes into the region with a series of fronts. Nothing especially noteworthy is expected at this point, but long-range weather models already indicate a 30 to 50 percent chance of rainfall exceeding one-half inch.
The fronts should move through by Saturday morning, followed by high pressure and mostly dry conditions for the weekend.
Weather Summaries and Full Area Forecast Discussions - South (Edited)
Summary - Southern New England - Massachusetts/Northern CT/Rhode Island
Summary:
Showers and thunderstorms are possible today, especially across the Connecticut River Valley, where an isolated strong to severe storm could produce damaging winds and torrential downpours. Most of the region will remain humid and mostly dry outside of the storm threat. Monday through Wednesday look drier, warmer, and more comfortable, with another chance for rain returning Thursday or Friday.
Key Messages:
- Showers and storms around today, especially toward the Connecticut River Valley, where an isolated strong to severe thunderstorm or two is possible.
- Drier and warmer next week before rain chances make a return sometime Thursday or Friday.
What has changed since the last Forecast Update?
No significant changes to the forecast.
What this means for you
Keep an eye on the sky this afternoon, particularly if you are in western Massachusetts or Connecticut. A few storms could become strong, with damaging winds the main concern. Heavy downpours are also possible. After today, conditions improve quickly, with lower humidity and more seasonable temperatures Monday through Wednesday. Rain chances increase again toward Thursday and Friday.
Click the Open/Close Button to Display the Full Edited Area Forecast Discussion
**Area Forecast Discussion, National Weather Service Boston/Norton MA,
144 PM EDT Sun Aug 23 2026**
**WHAT HAS CHANGED**
No significant changes to the forecast.
**KEY MESSAGES**
* Showers and storms around today, especially toward the Connecticut River Valley, where an isolated strong to severe thunderstorm or two is possible.
* Drier and warmer next week before rain chances make a return sometime Thursday or Friday.
**DISCUSSION**
**KEY MESSAGE 1, Showers and storms today**
Weak low pressure just northeast of the region continues to produce a northeast low level flow this morning, keeping overcast skies across southern New England. Spotty showers remain possible, mainly near Nantucket and the outer Cape, where showers are just offshore and moving northeast. Mist and fog will also continue across the region this morning.
The main concern today will be showers and thunderstorms developing during the afternoon. Showers moving across New York with an approaching cold front will reach western Massachusetts and Connecticut by the late morning or early afternoon. As the low pressure system to our northeast loses its influence, winds will turn more southerly, bringing in dew points in the 70s and increasing humidity.
The combination of higher humidity and daytime heating could provide enough instability for some storms to become strong to severe across the interior. Even though cloud cover will limit some of the daytime heating, forecast models show moderate instability over the Connecticut Valley during the afternoon. MUCAPE values around 1500 to 1800 J/kg represent available energy for thunderstorms, while MLCAPE values around 1200 to 1300 J/kg also support storm development.
Effective bulk shear around 40 knots, which measures how much the wind changes with height and helps storms organize, could support an isolated stronger or severe storm. The main threat from these storms would be damaging winds.
PWAT values, which measure the amount of moisture available in the atmosphere, will remain around 1.25 to 1.5 inches during the afternoon. This will support the potential for torrential downpours. The interior remains under a Marginal, 1 out of 5, risk for severe weather today.
Outside of the shower and thunderstorm threat, most of the region should remain mostly dry, although cloudy and dreary. Humid conditions will continue, with highs in the upper 70s.
**KEY MESSAGE 2, Drier and warmer next week**
The cold front to our west will move through the region Monday, quickly clearing the skies behind it. Drier air will move in behind the front, with dew points falling into the 50s and lower 60s and PWAT values dropping to around 1 inch or less.
Temperatures will return to more seasonable levels in the 70s and 80s. It should feel more comfortable than today because of the lower humidity. High pressure will gradually build in Tuesday and Wednesday, replacing the unsettled weather pattern over Quebec as that system shifts east.
Clear skies and dry weather are expected through Wednesday.
Greater uncertainty returns Thursday and Friday as another upper level disturbance, known as a shortwave, approaches and develops over the Great Lakes. Forecast models suggest increasing moisture during this period, along with a return of rain showers.
Latest ensemble guidance shows PWAT values increasing to around 1.5 inches from Thursday afternoon into Friday, along with more southerly winds near the surface. There are still differences among the forecast models regarding the track of the low pressure system associated with the shortwave. Because of this, the exact timing of any showers remains uncertain.
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: 75 Degrees - Low Temperature: 54 Degrees
(Tip: Place your cursor over the bar below to see the number)
Weather News/Headlines of Interest
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NYC streets almost turned to rivers after being hit by heavy storms
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Atlantic heating up with 3 areas to watch as El Ni?±o continues to strengthen to its strongest ever
Tornado tears through Dover, Delaware, leaving significant damage, prompting state of emergency
First taste of fall on the way as cooler air targets the eastern US
Magnitude 5.8 earthquake rattles Japan, shaking felt in Tokyo
Scientists uncover potentially significant movement at one of America's most dangerous fault lines
Sucky situation! Wild moment octopus latches onto fisherman’s face forcing him to club it to escape
New Hampshire can bill hikers for mountain rescues. A $25 card can help avoid the cost
Fall forecast 2026: Summer warmth may linger US as El Nino intensifies
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