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

27°F

-3°C

Humidity 58%
Wind Speed W 8 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 14 Feb 2:56 am EST
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 23. Calm wind.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 39. Wind chill values between 20 and 30. Calm wind becoming west around 6 mph.

    High: 39 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 23. Calm wind.

    Low: 23 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 38. Wind chill values between 25 and 35. Light and variable wind.

    High: 38 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 30 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 26. Calm wind.

    Low: 26 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 23. Calm wind.
Saturday
Mostly sunny, with a high near 39. Wind chill values between 20 and 30. Calm wind becoming west around 6 mph.
Saturday Night
Mostly clear, with a low around 23. Calm wind.
Sunday
Increasing clouds, with a high near 38. Wind chill values between 25 and 35. Light and variable wind.
Sunday Night
A 30 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 26. Calm wind.
Washington's Birthday
Partly sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Partly sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 50 percent chance of rain. Cloudy, with a high near 42.
Wednesday Night
Rain and snow likely. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Thursday
Mostly cloudy, with a high near 41.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 25.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 38. Chance of precipitation is 50%.
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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:
1:38 am EST Feb 14, 2026
Forecast Valid:
3am EST Feb 14, 2026-6pm EST Feb 20, 2026
 
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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