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

34°F

1°C

Humidity 85%
Wind Speed SW 6 mph
Barometer 29.73 in (1006.5 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 25 Feb 9:56 pm EST
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Southwest wind 7 to 9 mph becoming west after midnight.

    Low: 28 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 39. Calm wind becoming west around 6 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 20. Calm wind.

    Low: 20 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 39. Wind chill values between 20 and 30. Light and variable wind.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27. Calm wind.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 28.

    Low: 28 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 38.

    High: 38 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 28. Southwest wind 7 to 9 mph becoming west after midnight.
Thursday
Mostly sunny, with a high near 39. Calm wind becoming west around 6 mph.
Thursday Night
Mostly clear, with a low around 20. Calm wind.
Friday
Sunny, with a high near 39. Wind chill values between 20 and 30. Light and variable wind.
Friday Night
Mostly clear, with a low around 27. Calm wind.
Saturday
Mostly sunny, with a high near 46.
Saturday Night
Increasing clouds, with a low around 28.
Sunday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 38.
Sunday Night
Partly cloudy, with a low around 15.
Monday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 28.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 13.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 30%.
Tuesday Night
Snow likely. Mostly cloudy, with a low around 25. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
5:43 pm EST Feb 25, 2026
Forecast Valid:
10pm EST Feb 25, 2026-6pm EST Mar 4, 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