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

65°F

18°C

Humidity 93%
Wind Speed NE 13 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 7 Jul 4:56 am EDT
Extended Forecast for

Deep River CT

  • Overnight

    Overnight: Showers likely. Mostly cloudy, with a low around 60. Northeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 11am. Mostly cloudy, with a high near 72. Northeast wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 72 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 60. North wind 3 to 6 mph.

    Low: 60 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 81. North wind around 5 mph becoming calm in the morning.

    High: 81 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 84.

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Showers likely. Mostly cloudy, with a low around 60. Northeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Showers likely, mainly before 11am. Mostly cloudy, with a high near 72. Northeast wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Mostly cloudy, with a low around 60. North wind 3 to 6 mph.
Wednesday
Mostly sunny, with a high near 81. North wind around 5 mph becoming calm in the morning.
Wednesday Night
Partly cloudy, with a low around 64. Calm wind.
Thursday
Partly sunny, with a high near 84.
Thursday Night
A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.
Friday
A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 87.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 88.
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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:
3:22 am EDT Jul 7, 2026
Forecast Valid:
5am EDT Jul 7, 2026-6pm EDT Jul 13, 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