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.

Partly Cloudy

50°F

10°C

Humidity 93%
Wind Speed Calm
Barometer 29.78 in (1008.5 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 11 Mar 7:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: A slight chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a steady temperature around 53. Southwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    Low: 53 °F

    Chance
    Showers

  • Thursday

    Thursday: Rain showers likely before 5pm, then a chance of rain and snow showers. Cloudy, with a temperature falling to around 39 by 4pm. Southwest wind 7 to 14 mph becoming northwest in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 50 °F⇓

    Showers
    Likely then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of snow showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 28. West wind 5 to 8 mph.

    Low: 28 °F

    Chance Snow
    Showers then
    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 43. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 22 mph.

    High: 43 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 9 mph, with gusts as high as 24 mph.

    Low: 36 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Saturday Night

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

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers likely, mainly after 2am. Cloudy, with a low around 36. Chance of precipitation is 70%.

    Low: 36 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Tonight
A slight chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a steady temperature around 53. Southwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Thursday
Rain showers likely before 5pm, then a chance of rain and snow showers. Cloudy, with a temperature falling to around 39 by 4pm. Southwest wind 7 to 14 mph becoming northwest in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Thursday Night
A 30 percent chance of snow showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 28. West wind 5 to 8 mph.
Friday
Increasing clouds, with a high near 43. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 22 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 9 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 48.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
Showers likely, mainly after 2am. Cloudy, with a low around 36. Chance of precipitation is 70%.
Monday
Showers. High near 55. Chance of precipitation is 90%.
Monday Night
Showers likely. Mostly cloudy, with a low around 30. Chance of precipitation is 60%.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 40.
Tuesday Night
Mostly clear, with a low around 21.
Wednesday
Mostly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.35°N 72.29°W (Elev. 98 ft)
Last Update:
7:41 pm EDT Mar 11, 2026
Forecast Valid:
8pm EDT Mar 11, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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