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

43°F

6°C

Humidity 51%
Wind Speed W 16 G 33 mph
Barometer 29.37 in (994.4 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 15 Jan 1:56 pm EST
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Partly cloudy, with a low around 20. Wind chill values between 10 and 15. West wind 9 to 11 mph, with gusts as high as 29 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 35. Wind chill values between 5 and 15. West wind 8 to 14 mph, with gusts as high as 30 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 28. Southwest wind around 5 mph becoming calm in the evening.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of snow before 10am, then a chance of rain and snow between 10am and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 41. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 50%.

    High: 41 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Cloudy

  • Sunday

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

    High: 38 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 21.

    Low: 21 °F

    Decreasing
    Clouds

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 20. Wind chill values between 10 and 15. West wind 9 to 11 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 35. Wind chill values between 5 and 15. West wind 8 to 14 mph, with gusts as high as 30 mph.
Friday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 28. Southwest wind around 5 mph becoming calm in the evening.
Saturday
A chance of snow before 10am, then a chance of rain and snow between 10am and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 41. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 50%.
Saturday Night
Mostly cloudy, with a low around 29. Calm wind.
Sunday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 38.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 21.
M.L.King Day
Sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 11.
Wednesday
Mostly sunny, with a high near 30.
Wednesday Night
Mostly cloudy, with a low around 22.
Thursday
Mostly sunny, with a high near 35.
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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:
12:42 pm EST Jan 15, 2026
Forecast Valid:
3pm EST Jan 15, 2026-6pm EST Jan 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation