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.

Mostly Cloudy and Breezy

34°F

1°C

Humidity 50%
Wind Speed W 22 G 40 mph
Barometer 29.87 in (1011.3 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 12 Jan 12:56 am EST
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Mostly clear, with a low around 27. Wind chill values between 20 and 25. West wind around 10 mph, with gusts as high as 32 mph.

    Low: 27 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 40. Wind chill values between 20 and 30. West wind 7 to 10 mph, with gusts as high as 25 mph.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30. West wind around 6 mph.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 43. Southwest wind 3 to 7 mph.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 38. South wind 3 to 6 mph. Winds could gust as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 47.

    High: 47 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain. Cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 43.

    High: 43 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 50%.

    Low: 22 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Overnight
Mostly clear, with a low around 27. Wind chill values between 20 and 25. West wind around 10 mph, with gusts as high as 32 mph.
Monday
Sunny, with a high near 40. Wind chill values between 20 and 30. West wind 7 to 10 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 30. West wind around 6 mph.
Tuesday
Sunny, with a high near 43. Southwest wind 3 to 7 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 38. South wind 3 to 6 mph. Winds could gust as high as 20 mph.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 47.
Wednesday Night
A 30 percent chance of rain. Cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
Thursday Night
A chance of rain before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 50%.
Friday
A 30 percent chance of snow before 1pm. Partly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Partly cloudy, with a low around 26.
Sunday
A 40 percent chance of rain. Partly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
1:42 pm EST Jan 11, 2026
Forecast Valid:
1am EST Jan 12, 2026-6pm EST Jan 18, 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