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.

Overcast

49°F

9°C

Humidity 71%
Wind Speed S 17 G 28 mph
Barometer 29.50 in (999.0 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 10 Dec 1:56 pm EST
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: A 50 percent chance of rain. Cloudy, with a high near 49. Southwest wind around 14 mph, with gusts as high as 28 mph.

    High: 49 °F

    Chance Rain

  • Tonight

    Tonight: Rain, mainly before 10pm. Low around 28. Southwest wind 8 to 10 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 28 °F

    Rain then
    Chance Rain

  • Thursday

    Thursday: A 20 percent chance of snow showers after 1pm. Mostly sunny, with a temperature rising to near 35 by noon, then falling to around 30 during the remainder of the day. Wind chill values between 20 and 25. West wind 11 to 17 mph, with gusts as high as 38 mph.

    High: 35 °F⇓

    Mostly Sunny
    then Slight
    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 21. Wind chill values between 10 and 15. West wind 11 to 14 mph, with gusts as high as 39 mph.

    Low: 21 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. West wind 9 to 13 mph, with gusts as high as 26 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A 40 percent chance of snow before 1pm. Partly sunny, with a high near 34.

    High: 34 °F

    Chance Snow

Detailed Forecast

This Afternoon
A 50 percent chance of rain. Cloudy, with a high near 49. Southwest wind around 14 mph, with gusts as high as 28 mph.
Tonight
Rain, mainly before 10pm. Low around 28. Southwest wind 8 to 10 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A 20 percent chance of snow showers after 1pm. Mostly sunny, with a temperature rising to near 35 by noon, then falling to around 30 during the remainder of the day. Wind chill values between 20 and 25. West wind 11 to 17 mph, with gusts as high as 38 mph.
Thursday Night
Partly cloudy, with a low around 21. Wind chill values between 10 and 15. West wind 11 to 14 mph, with gusts as high as 39 mph.
Friday
Sunny, with a high near 36. West wind 9 to 13 mph, with gusts as high as 26 mph.
Friday Night
Partly cloudy, with a low around 22.
Saturday
Partly sunny, with a high near 39.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 25.
Sunday
A 40 percent chance of snow before 1pm. Partly sunny, with a high near 34.
Sunday Night
Mostly clear, with a low around 16.
Monday
Sunny, with a high near 30.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.33°N 72.32°W (Elev. 56 ft)
Last Update:
1:09 pm EST Dec 10, 2025
Forecast Valid:
2pm EST Dec 10, 2025-6pm EST Dec 16, 2025
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation