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

33°F

1°C

Humidity 58%
Wind Speed N 5 mph
Barometer 30.46 in (1031.2 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 30 Nov 4:56 am EST
Extended Forecast for

South Lyme CT

  • Today

    Today: Rain after 1pm. High near 52. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Cloudy then
    Rain

  • Tonight

    Tonight: Rain likely before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 31. West wind around 8 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 31 °F

    Rain Likely
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 43. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.

    High: 43 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain and snow, becoming all rain after 10am. High near 46. Calm wind becoming east 5 to 8 mph in the morning. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    High: 46 °F

    Rain/Snow
    then Rain

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 25.

    Low: 25 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 41.

    High: 41 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

Detailed Forecast

Today
Rain after 1pm. High near 52. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Rain likely before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 31. West wind around 8 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Sunny, with a high near 43. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 25. Calm wind.
Tuesday
Rain and snow, becoming all rain after 10am. High near 46. Calm wind becoming east 5 to 8 mph in the morning. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Tuesday Night
A 50 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 25.
Wednesday
Sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Mostly clear, with a low around 14.
Friday
Mostly sunny, with a high near 33.
Friday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 23.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.33°N 72.32°W (Elev. 56 ft)
Last Update:
1:09 am EST Nov 30, 2025
Forecast Valid:
5am EST Nov 30, 2025-6pm EST Dec 6, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation