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.

Mostly Cloudy

73°F

23°C

Humidity 94%
Wind Speed SW 7 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 8 Aug 12:56 am EDT
Extended Forecast for

Deep River CTSimilar City Names

Heat Advisory August 8, 01:40am until August 8, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 8, 01:40am until August 8, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Overnight

    Low: 73 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 88. Heat index values as high as 98. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 88 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Light west wind. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 90. Heat index values as high as 98. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Overnight
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 73. Calm wind.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 88. Heat index values as high as 98. Calm wind becoming southwest 5 to 8 mph in the morning.
Saturday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Light west wind. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 90. Heat index values as high as 98. Calm wind becoming west 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 66. Calm wind.
Monday
Sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 66.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Deep River CTSimilar City Names
 41.39°N 72.43°W (Elev. 49 ft)
Last Update:
8:49 pm EDT Aug 7, 2026
Forecast Valid:
1am EDT Aug 8, 2026-6pm EDT Aug 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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