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Groton, CT Weather
Current conditions
Observed at Groton / New London, Groton / New London Airport · 1 hr ago
Forecast
10-day-
This Afternoon
Mostly cloudy, with a high near 57. Northeast wind 16 to 23 mph.
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Tonight
Mostly cloudy, with a low around 48. North wind 16 to 21 mph.
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Thursday
Mostly sunny, with a high near 62. North wind 13 to 21 mph.
National Weather Service forecast updated 5 hrs ago.
Hourly
Hourly forecast- Now56°
- 6 PM55°
- 7 PM52°
- 8 PM51°
- 9 PM50°
- 10 PM49°
- 11 PM49°
- Thu12 AM48°
- 1 AM48°
- 2 AM48°
- 3 AM48°
- 4 AM48°
- 5 AM49°
- 6 AM48°
- 7 AM48°
- 8 AM48°
- 9 AM50°
- 10 AM53°
- 11 AM55°
- 12 PM56°
- 1 PM57°
- 2 PM60°
- 3 PM60°
- 4 PM61°
10-day forecast
Details- TodayOct 21Mostly Cloudy48°57°
- ThuOct 22Mostly Sunny42°62°
- FriOct 23Sunny38°54°
- SatOct 24Sunny40°57°
- SunOct 25Sunny46°61°
- MonOct 26Sunny49°64°
- TueOct 27Mostly Sunny44°60°
- WedOct 28Cloudy41°55°
- ThuOct 29Cloudy0.02 in41°61°
- FriOct 30Cloudy56°64°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in Connecticut
More weather news-
Nor’easter will stay offshore, but Connecticut faces gusty winds WednesdayA nor'easter swirling off the East Coast will stay offshore as it moves north this week, bringing some strong winds to Connecticut. A nor'easter is hanging out off the East Coast of the U.S. this week, and while it's…
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A warmer Tuesday in Connecticut with a mix of sun and clouds. Here's when the chill sets in again.Leaves begin to change color at a home on Sport Hill Road in Easton on Oct. 7, 2026. Another day of seasonable fall weather is in store for Connecticut Tuesday — but expect it to be a little cloudier and breezier than…
- Wfsb says Connecticut stays mostly dry as offshore storm nears
Wfsb says Connecticut should stay mostly dry and mild this week as a nor’easter strengthens offshore, with only a low chance of rain late Wednesday and Wednesday night in southeastern Connecticut. Most of the state…
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Colorful peak fall foliage is spreading across Connecticut. Here’s when to see itTrees bursting with color at Bantam Lake in Morris Oct. 15, 2026. Fall foliage surrounds First Congregational Church in Litchfield Oct. 15, 2026. Fall foliage along Bantam Lake's eastern/southeastern shore in Morris…
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Connecticut warms back toward 60 Monday after weekend chill. Here's when rain returns.Connecticut starts the week with a chilly morning and plenty of sunshine, but the weekend’s deep chill is easing. Temperatures will climb back toward 60 degrees Monday, with lighter winds and dry weather statewide. The…
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Connecticut wakes to 20s and 30s Sunday before sunshine pushes highs into 50s. Here's the forecast.Saturday brought the coldest air of the season so far, and Sunday keeps the autumn chill in place across Connecticut. Sunshine returns statewide, winds ease considerably and temperatures make a modest recovery, although…
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CONNECTICUT FORECAST: Morning - Sunday, Oct. 18, 2026fox61.com CONNECTICUT FORECAST: Morning - Sunday, Oct. 18, 2026 To stream FOX61 on your phone, you need the FOX61 app. Download the FOX61 app Next up in 5 Example video title will go here for this video Before You…
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Connecticut rain totals: More than 17 towns topped 0.5 inchesRain and gusty winds moved across Connecticut Friday into Saturday morning as a cold front brought a sharp drop in temperatures. Canaan recorded over three quarters of an inch of rain Saturday while more than 17…
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Hazardous Weather Outlook Issued For Inland Sections Of Southern ConnecticutINLAND SECTIONS OF SOUTHERN CONNECTICUT — A hazardous weather outlook and freeze warning have been issued for interior sections of southern Connecticut from midnight until 9 a.m. Sunday. "Sub-freezing temperatures as…
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Freeze warnings in effect for much of Connecticut tonightOct 17, 2026, 5:46 AM A Freeze Warning is in effect north of I-95 tonight. Widespread freezing cold is expected there tonight with scattered frost expected south to Merritt Parkway Windy & feels like only 50-degrees…
Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- WedGood (28)
- ThuGood (33)
New London-Groton, CT reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyNorwich Public Utility Plant, records since 1956. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Middletown 53 km
- Norwich 19 km
- Coventry 51 km
- Glastonbury 60 km
- South Kingstown 47 km
- North Kingstown 56 km
- New London 2 km
- Mansfield City 48 km
- Windham 39 km
- Guilford 51 km
- Montville Center 16 km
- Waterford 5 km
Forecasters' discussion
From the National Weather Service office in OKX, issued 4 hrs ago
What Has Changed
Updated highs today.
Key Messages
1) Mainly dry conditions will continue into early next week with gusty N-NE winds continuing through the end of this week.
2) Minor coastal flooding expected across the south shore back bays of Nassau, western portions of the Great South Bay, and lower NY Harbor with late this afternoon/early evening high tide. Additional localized minor coastal flooding possible on Thursday.
Key Message 1
Based on trends and some later guidance, have raised temperatures a few degrees. Most locations are now forecast to get to around 60 if not higher.
The low pressure/nor'easter located about 350 miles southeast of Fire Island will continue meandering today before gradually picking up speed tonight, then track ENE-NE away from the coast Thursday into Friday.
The main sensible weather impact will be from the continuation of gusty N-NE winds, especially close to the coast. Gusts 25-35 mph are anticipated with a low chance of a few immediate coast locations reaching 40 mph, mainly along the southeast coast of Long Island. Further inland, gusts 20-25 mph are expected. Gusts may become occasional or end away from the coast tonight where gusts 25-35 mph remain possible. By Thursday, gusts should be weaker as the storm starts moving further offshore.
Otherwise, a weak surface trough/cold front will move across the northeast late Thursday into Thursday night. This is associated with a fast moving northern stream trough that will help push the storm well offshore. Behind these systems, high pressure will reestablish itself over southeast Canada Thursday night and then builds over the northeast Friday into the weekend. The high will remain in control into early next week.
The forecast is largely dry through the next week. The only exception is for the east end/forks of Long Island where a brief shower is possible this evening as some moisture could pivot well NW of the offshore storm. There is a good amount of low level dry air to overcome, so it may just end up being a few sprinkles.
Mid and upper level clouds will increase from the SE through the day today with mostly cloudy conditions likely for eastern half of the area. These clouds will diminish late tonight into Thursday. Mostly clear conditions are then forecast through early next week.
Outlook For 18z Thursday Through Monday
Thursday: VFR. NNW winds G15-25kt.
Friday: VFR. NNE winds, with G15-20kt mainly in morning.
Saturday, Sunday, and Monday: VFR with light winds.
Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.