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.

Fair

73°F

23°C

Humidity 100%
Wind Speed SW 3 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 15 Jul 8:56 pm EDT
Extended Forecast for

Hadlyme CT

Heat Advisory July 16, 11:00am until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Heat index values as high as 98. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 72. South wind 3 to 6 mph.

    Low: 72 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 85. Heat index values as high as 96. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 73. Southwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 70. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Heat index values as high as 98. Calm wind becoming south 5 to 7 mph in the afternoon.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 72. South wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 85. Heat index values as high as 96. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 73. Southwest wind around 6 mph. Chance of precipitation is 30%.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 66.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 82.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hadlyme CT
 41.4°N 72.34°W (Elev. 299 ft)
Last Update:
3:16 pm EDT Jul 15, 2025
Forecast Valid:
9pm EDT Jul 15, 2025-6pm EDT Jul 22, 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