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.

Overcast

70°F

21°C

Humidity 97%
Wind Speed NE 6 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 17 Aug 9:56 pm EDT
Extended Forecast for

Deep River CT

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Light and variable wind becoming west around 5 mph in the afternoon.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 86. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68. Light and variable wind.

    Low: 68 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 84.

    High: 84 °F

    Sunny then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 67. Calm wind.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Light and variable wind becoming west around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 65. Calm wind.
Wednesday
Sunny, with a high near 86. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 68. Light and variable wind.
Thursday
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 84.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 62.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 82.
Friday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 62.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 80.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 64.
Sunday
Showers likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 81.
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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:
4:44 pm EDT Aug 17, 2026
Forecast Valid:
10pm EDT Aug 17, 2026-6pm EDT Aug 24, 2026
 
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