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

Hazardous Weather Conditions

Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fog/Mist

61°F

16°C

Humidity 100%
Wind Speed SE 3 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 61°F (16°C)
Visibility 1.25 mi
Last update 18 Jun 1:56 am EDT
Extended Forecast for

Deep River CT

Dense Fog Advisory until June 18, 07:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until June 18, 07:00am

    NOW until 7:00am Wed

    Dense Fog Advisory

  • Overnight

    Low: 64 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a slight chance of showers and thunderstorms after 11am. Areas of dense fog before 8am. Otherwise, cloudy, with a high near 75. South wind 3 to 6 mph. Chance of precipitation is 40%.

    High: 75 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Light south wind.

    Low: 66 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Heat index values as high as 99. Light southwest wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 24 mph.

    High: 90 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly between 8pm and 2am. Mostly cloudy, with a low around 65. Southwest wind 7 to 9 mph, with gusts as high as 20 mph.

    Low: 65 °F

    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms. Areas of dense fog. Otherwise, cloudy, with a low around 64. Light southeast wind.
Wednesday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a slight chance of showers and thunderstorms after 11am. Areas of dense fog before 8am. Otherwise, cloudy, with a high near 75. South wind 3 to 6 mph. Chance of precipitation is 40%.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Light south wind.
Juneteenth
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Heat index values as high as 99. Light southwest wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 24 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly between 8pm and 2am. Mostly cloudy, with a low around 65. Southwest wind 7 to 9 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 66.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 95.
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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:
9:55 pm EDT Jun 17, 2025
Forecast Valid:
2am EDT Jun 18, 2025-6pm EDT Jun 24, 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