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.

Fair

37°F

3°C

Humidity 73%
Wind Speed NW 6 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 6 Dec 7:56 pm EST
Extended Forecast for

Deep River CT

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 41. Light and variable wind.

    High: 41 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. Calm wind becoming northwest 5 to 7 mph after midnight.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 30. Wind chill values between 10 and 20. North wind 9 to 13 mph, with gusts as high as 24 mph.

    High: 30 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12. North wind around 5 mph becoming calm in the evening.

    Low: 12 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 39.

    High: 39 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. Calm wind.
Sunday
Partly sunny, with a high near 41. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 22. Calm wind becoming northwest 5 to 7 mph after midnight.
Monday
Sunny, with a high near 30. Wind chill values between 10 and 20. North wind 9 to 13 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 12. North wind around 5 mph becoming calm in the evening.
Tuesday
Increasing clouds, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 29.
Wednesday
A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 47.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 32.
Thursday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 44.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.
Friday
A chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of snow. Partly cloudy, with a low around 21.
Saturday
Mostly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Deep River CT
 41.39°N 72.43°W (Elev. 49 ft)
Last Update:
4:40 pm EST Dec 6, 2025
Forecast Valid:
8pm EST Dec 6, 2025-6pm EST Dec 13, 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