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Chance of a shower tonight

Partly Sunny, Chance of a shower Monday

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Last Complete Site Update: 5/18 - 6:25 PM

Weather for New England and the Northeast

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Delivering Weather Forecasts for New England for the last 25+ years
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All things seem possible in May.
- Edwin Way Teale

Now in Peterborough, NH

Time of the readings below: 18 May 2025 8:55 PM

Current Weather Readings

(FYI: The number in parenthesis below is the change in the last hour)

Current Temperature: 56.2°F (-2.6)
High Temperature for today: 61.0 at 6:30 PM.
Low Temperature for Today: 54.0 at 6:15 AM.
Rainfall Today: 0.02 inches
Current Dewpoint Temperature: 54.2°F (0.6)
Highest Heat Index Today: 61.0 at 6:30 PM
Hours of Daylight Tomorrow: 14:46
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Your Daily Forecast - Three Days at a Time

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Monday/Monday Night

Nashua - East

BlankDay

Isolated showers after 2pm. Partly sunny, with a high near 61. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

BlanknightS

Mostly cloudy, with a low around 45. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

Peterborough - Central/West

BlankDay

Partly sunny, with a high near 59. Northwest wind around 15 mph, with gusts as high as 30 mph.

BlanknightS

Mostly cloudy, with a low around 41. Northwest wind 5 to 10 mph, with gusts as high as 25 mph.

Tuesday/Tuesday Night

Nashua - East

BlankDay

Partly sunny, with a high near 63. North wind around 5 mph.

BlanknightS

Mostly cloudy, with a low around 46. Calm wind.

Peterborough - Central/West

BlankDay

Partly sunny, with a high near 58. North wind around 5 mph.

BlanknightS

Mostly cloudy, with a low around 44. Calm wind.

Wednesday/Wednesday Night

Nashua - East

BlankDay

A 40 percent chance of showers after 2pm. Cloudy, with a high near 55.

BlanknightS

Showers likely, mainly after 2am. Cloudy, with a low around 44. Chance of precipitation is 60%.

Peterborough - Central/West

BlankDay

A 50 percent chance of showers. Mostly cloudy, with a high near 51.

BlanknightS

Showers likely, mainly after 2am. Cloudy, with a low around 42. Chance of precipitation is 60%.

Thursday/Thursday Night

Nashua - East

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BlanknightS


Peterborough - Central/West

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BlanknightS


Friday/Friday Night

Nashua - East

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BlanknightS


Peterborough - Central/West

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BlanknightS


Saturday/Saturday Night

Nashua - East

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BlanknightS


Peterborough - Central/West

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BlanknightS


Sunday/Sunday Night

Nashua - East

BlankDay



BlanknightS

Scattered showers, mainly before 9pm. Mostly cloudy, with a low around 51. Northwest wind around 10 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

Peterborough - Central/West

BlankDay



BlanknightS

Scattered showers, mainly before 10pm. Mostly cloudy, with a low around 47. West wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Maps for Today

None

daily briefing

Temperature Trend

New England 1

Looking at Monday

New England 2
Allergy Map 1Allergy Map 2
Seasonal Info

Rich's Weather Discussion

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netop2

At this moment: 5/18 - 6:26 PM

Welcome to the new site! Some weather feeds are working others are not, FYI. I hope to have them all working soon.
If you find anything NOT working, or have questions, etc, use the form available at the bottom of each page to contact me.

It was a mostly cloudy day with a shower here and there. I was in Antrim during mid afternoon, and it rained for at least 30 minutes, with drizzle. Chance of some showers tonight, then a mostly dry, breezy, cool Monday with a small chance of an afternoon shower.

The BIG Picture:
Summary - NH/ME:
Unsettled weather continues as a slow-moving upper-level low brings scattered showers and breezy conditions through Monday. Another system arrives late week with a chance for a soaking rain, especially on Thursday, depending on how close the storm tracks to the coast. Temperatures will stay cool with highs mostly in the 50s and 60s and lows dipping into the 40s and even some 30s across the north.

Summary: MA
Expect breezy and unseasonably cool weather through the week. A few quick showers may pass north of I-90 tonight and Monday, but most areas stay dry. A late-season Nor'easter could bring chilly, windswept rain from late Wednesday into early Friday, although exact storm track remains uncertain.

On this day in 1980, Mount Saint Helens (in Washington State) erupted spewing ash and smoke sixty-three thousand feet into the air. Heavy ash covered the ground to the immediate northwest, and small particles were carried to the Atlantic coast.

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Fog%20decline
1.2.3

Forecaster's Discussion: New Hampshire/Maine Edition (Edited)


Area Forecast Discussion
National Weather Service Gray ME
Issued 308 PM EDT Sunday May 18 2025

Synopsis
The pattern of upper-level low pressure systems continues. An upper low currently overhead will slowly move east through Tuesday, keeping scattered showers in the forecast. A brief break in the unsettled weather comes Tuesday night into Wednesday as high pressure builds in from the north. By midweek, another upper-level system will move in from the Great Lakes, likely forming a surface low that could bring soaking rainfall to New England Thursday into Friday. This system will move slowly and continue to affect the region into the weekend.

Near Term through Tonight
Scattered showers this afternoon are the result of an upper-level low and heating from the sun, which is known as diurnal instability. Showers are most widespread north of a Lebanon NH to Portland ME line, where chances range from 60 to 70 percent. There is enough energy in the atmosphere to support isolated thunderstorms, and some of these could produce small hail.

South of that line, chances for showers are lower, around 30 to 50 percent. As we lose daytime heating after sunset, shower activity should begin to taper off. Still, small waves of energy, known as shortwaves, may keep a few showers going overnight, especially in the mountains where upslope flow supports continued lift and moisture.

Winds are already gusty across parts of New Hampshire, and these conditions will continue into tonight with gusts up to around 30 mph. Overnight, western Maine will also see increasing winds as colder air filters in and pressure differences increase.

Short Term Monday through Monday Night
On Monday, the upper and surface low pressure centers stack near Nova Scotia, a setup referred to as vertically stacked. This alignment helps pull in cooler air from the northwest, keeping temperatures on the chilly side. Highs will mostly stay in the 50s south of the mountains, with some spots in southern New Hampshire approaching 60 degrees. In the mountains, clouds and cool air may keep highs below 50 degrees.

Winds will remain brisk, with gusts from 25 to 35 mph, and some locations may experience gusts above 40 mph during the late morning and afternoon due to mixing in the lower part of the atmosphere.

Skies will stay mostly cloudy as cyclonic flow, which means counterclockwise rotation around the low, keeps pulling in moisture. South of the mountains, expect isolated to scattered showers. In the mountains, expect more widespread showers due to upslope enhancement.

By Monday night, showers should diminish outside the mountains, but a few may linger in eastern areas as the upper-level low continues to spin nearby. Overnight temperatures will fall into the 40s, with some northern spots seeing upper 30s.

Long Term Tuesday through Sunday
A weather blocking pattern over Greenland will slow down system movement, keeping an upper low parked near the Canadian Maritimes through Tuesday and Wednesday. Meanwhile, surface high pressure from the north will attempt to bring drier weather into the area.

Tuesday will remain mostly cloudy, with scattered showers likely in the mountains. South of the mountains, some sun may break through, allowing highs to reach the low 60s. In the north, highs will stay in the low 50s.

By Tuesday night into Wednesday, high pressure will briefly bring dry and cooler conditions. Onshore winds will help keep highs mostly in the 50s across the area on Wednesday.

Midweek, an upper low moving out of the Great Lakes is expected to develop a surface low near the Mid Atlantic coast by Wednesday night. Ensemble model guidance, which shows a range of possible outcomes, continues to suggest that the surface low will track somewhere between the Mid Atlantic and a position south of Cape Cod.

If the low tracks close to the coast, a widespread soaking rain is possible on Thursday. Recent model trends, however, show some suggestion that high pressure to the north could limit how far north the rain gets. The current forecast leans on the National Blend of Models (NBM), which brings a good chance of rain Thursday into Friday morning. Precipitation totals could be significant, but there is still uncertainty in the storm’s exact track.

As the surface low moves into the Canadian Maritimes late in the week, the upper low from the Great Lakes will cross New England, keeping chances for scattered showers through the weekend.

Other Versions of the NWS Weather Summary

Unedited Weather Summary- NWS gray, Maine
This office covers New Hampshire and Maine
UnEdited Gray ME
Unedited Weather Summary - NWS Norton, MA
This office covers Massachusetts, N. Connecticut, RI
UnEdited - MA

1.2.3

Forecaster's Discussion: Massachusetts Edition (Edited)


Area Forecast Discussion
National Weather Service Boston/Norton MA
Issued at 258 PM EDT Sunday May 18 2025

Synopsis
Temperatures remain cooler than normal tonight and Monday with breezy northwest winds. Only a few quick showers are expected, mainly north of I-90. The cool pattern continues through the rest of the week. A late-season Nor'easter may bring cold, windy rain starting late Wednesday and lasting into early Friday.

Near Term, Until 6 AM Monday Morning

Key Points

 - A few brief showers possible this evening, mainly north of I-90
 - Breezy and cool overnight with lows in the upper 40s to lower 50s

Details
An unusual closed low pressure system in the upper atmosphere is centered over Maine and will slowly shift east into the Canadian Maritimes tonight. The cold air aloft, combined with daytime heating, has helped spark a few quick showers mainly north of I-90. These showers should fade later this evening as temperatures cool and surface heating fades.

As the upper low drifts eastward, it will bring cooler air from the northwest, a process known as cold advection. A modest jet stream just above the surface will support gusty northwest winds, with speeds reaching 20 to 30 miles per hour. Overnight temperatures will drop into the upper 40s to lower 50s, but it will feel cooler due to the breeze.

Short Term, Monday Through Monday Night

Key Points

 - Breezy and unseasonably cool Monday with lots of clouds and some sun
 - A few quick showers possible in northeast Massachusetts
 - Highs mainly in the 60s, with some northern areas struggling to reach 60
 - Monday night will be cool and breezy, with wind chills in the 30s by Tuesday morning

Details
The upper level low will slowly shift southeast of the Canadian Maritimes during the day on Monday and into Monday night. This will keep southern New England in a pattern of cool, breezy conditions. Air circulating around the low will bring a deck of low clouds called strato-cumulus, though some sun will break through, especially in western Massachusetts and Connecticut.

A small ripple of energy aloft, called a shortwave disturbance, will move south from the low and may bring a brief shower or two to northeast Massachusetts. Most of the region will stay dry.

Highs on Monday will be below normal for mid May, reaching into the 60s in most areas. Northern Massachusetts, especially the higher elevations, may stay in the upper 50s. Winds from the northwest will gust between 25 and 30 miles per hour, and a few areas may see gusts near 35 miles per hour. This will make it feel even cooler.

Monday night will remain breezy and unseasonably chilly, with lows falling into the 40s. Wind chill values by Tuesday morning will dip into the 30s to lower 40s.

Long Term, Tuesday Through Sunday

Key Points

 - Cooling trend continues through midweek, especially Wednesday and Thursday
 - Coastal storm may bring rain and gusty winds late Wednesday into Friday
 - Forecast confidence increasing slightly, but exact storm track still uncertain

Details
Tuesday will begin a stretch of below normal temperatures that will last through at least Thursday. A northwest flow behind the departing upper low will continue to pull in cooler air. Winds will gradually shift to the northeast during the day Tuesday. Highs will be near 60 degrees on Tuesday, with Wednesday and Thursday likely falling short of 60 in most areas.

A coastal low pressure system is expected to move up the eastern seaboard and may approach southern New England late Wednesday into Thursday. This late-season Nor'easter could bring a period of moderate to heavy rain and gusty winds.

Forecast models are beginning to come into better agreement on timing, suggesting the system will pass near or southeast of the region Thursday afternoon or evening. However, the exact track is still uncertain. The Canadian model (GEM) brings the center over southeast Massachusetts, while the American (GFS) and European (ECMWF) models track it southeast of Nantucket. The GFS keeps the storm well offshore, while the ECMWF tracks it closer to the region.

This uncertainty is reflected in precipitation estimates from ensemble forecasts. The GEFS ensemble suggests around 0.45 inches of rain across southern New England, while the ECMWF ensemble shows some areas receiving close to one inch. A closer track would bring heavier rain and stronger winds. If the low stays farther offshore, both wind and rainfall would be lighter.

Regardless of the exact path, wetting rain and breezy conditions are likely late in the week. The pattern will remain unsettled and cool with broad upper level cyclonic flow and cold air remaining in place aloft.

Other Versions of the NWS Weather Summary

Unedited Weather Summary- NWS gray, Maine
This office covers New Hampshire and Maine
UnEdited Gray ME
Unedited Weather Summary - NWS Norton, MA
This office covers Massachusetts, N. Connecticut, RI
UnEdited - MA

Five Day Daily Temperature Run - Peterborough, NH

(Tip: Place your cursor over the bar to see the number)

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Current Weather Maps

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Expected Temperatures in New England

New England High TemperatureACCHiScale
New England Low TemperatureACCLoScale

Regional Weather Discussions

Updated once in the morning - These are provided by the NWS, WMUR-TV, or me...
Manchester, NH: Last Updated: 5/18 - 7:26 AM

A cooler and unsettled weather pattern develops in the days ahead. Temperatures will remain below average for several days, along with just about daily shower chances.
We'll start Sunday with some early sunshine, especially in central and southern New Hampshire. It turns mostly cloudy during the afternoon with scattered showers. High temperatures will reach the 60s.
Staying mostly cloudy with more showers tonight, especially north. Lows in the 40s to lower 50s.
Both Monday and Tuesday will have more clouds than sun. There may be a few scattered afternoon showers, and temperatures will struggle to reach 60 degrees.
Clouds will be locked in on Wednesday and Thursday. The best chance for a steady rainfall will be Thursday into Thursday night, as cool ocean air remains stuck in place. Showers will likely linger into Friday.

New England Radar
NWS Current USA Weather Map
Peterborough, NH Almanac
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