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

40°F

4°C

Humidity 93%
Wind Speed W 10 mph
Barometer 29.79 in (1008.7 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 11 Jan 6:56 am EST
Extended Forecast for

South Lyme CT

  • Today

    Today: A chance of rain before 1pm, then a slight chance of snow showers after 4pm. Cloudy through mid morning, then gradual clearing, with a high near 46. Light west wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    High: 46 °F

    Chance Rain
    then Slight
    Chance
    Rain/Snow

  • Tonight

    Tonight: A 30 percent chance of snow showers, mainly between 7pm and 10pm. Partly cloudy, with a low around 27. Wind chill values between 15 and 25. West wind 14 to 18 mph, with gusts as high as 32 mph.

    Low: 27 °F

    Chance Snow
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 40. Wind chill values between 15 and 25. West wind 8 to 13 mph, with gusts as high as 25 mph.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29. Southwest wind 6 to 8 mph.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 43. West wind 5 to 9 mph.

    High: 43 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 38.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 46.

    High: 46 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Cloudy, with a low around 31.

    Low: 31 °F

    Cloudy then
    Chance Rain

  • Thursday

    Thursday: A 30 percent chance of rain. Partly sunny, with a high near 39.

    High: 39 °F

    Chance Rain

Detailed Forecast

Today
A chance of rain before 1pm, then a slight chance of snow showers after 4pm. Cloudy through mid morning, then gradual clearing, with a high near 46. Light west wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Tonight
A 30 percent chance of snow showers, mainly between 7pm and 10pm. Partly cloudy, with a low around 27. Wind chill values between 15 and 25. West wind 14 to 18 mph, with gusts as high as 32 mph.
Monday
Sunny, with a high near 40. Wind chill values between 15 and 25. West wind 8 to 13 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 29. Southwest wind 6 to 8 mph.
Tuesday
Increasing clouds, with a high near 43. West wind 5 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 38.
Wednesday
Cloudy, with a high near 46.
Wednesday Night
A 30 percent chance of rain after 1am. Cloudy, with a low around 31.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 39.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 20.
Friday
Partly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Mostly sunny, with a high near 37.
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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:
1:40 am EST Jan 11, 2026
Forecast Valid:
7am EST Jan 11, 2026-6pm EST Jan 17, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation