National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Deep River CT

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Patchy Fog

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 83. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 83 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Patchy fog after 1am. Otherwise, increasing clouds, with a low around 68. Light southeast wind.

    Low: 68 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 84. Calm wind becoming south around 6 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light southwest wind. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 67. Calm wind.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 83. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Sunday Night
Patchy fog after 1am. Otherwise, increasing clouds, with a low around 68. Light southeast wind.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 84. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light southwest wind. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 90.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 72.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Deep River CT
 41.39°N 72.43°W (Elev. 49 ft)
Last Update:
6:14 pm EDT Jul 12, 2025
Forecast Valid:
1am EDT Jul 13, 2025-6pm EDT Jul 19, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation