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.

Fair

78°F

26°C

Humidity 67%
Wind Speed S 8 mph
Barometer 29.87 in (1011.3 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Aug 3:56 pm EDT
Extended Forecast for

3 Miles SE South Lyme CT

  • Tonight

    Tonight: Mostly clear, with a low around 69. Southwest wind 3 to 7 mph.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers between 11am and 2pm. Mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers. Partly sunny, with a high near 77. East wind around 7 mph.

    High: 77 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 64. East wind around 5 mph.

    Low: 64 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely. Mostly cloudy, with a high near 76. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers. Partly sunny, with a high near 79.

    High: 79 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 69. Southwest wind 3 to 7 mph.
Thursday
A slight chance of showers between 11am and 2pm. Mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 64. Calm wind.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 77. East wind around 7 mph.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 64. East wind around 5 mph.
Saturday
Showers likely. Mostly cloudy, with a high near 76. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Showers likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 65.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE South Lyme CT
 41.3°N 72.24°W (Elev. 0 ft)
Last Update:
2:29 pm EDT Aug 19, 2026
Forecast Valid:
4pm EDT Aug 19, 2026-6pm EDT Aug 26, 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