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

23°F

-5°C

Humidity 85%
Wind Speed N 3 mph
Barometer 30.35 in (1027.7 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 19 Mar 3:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Mostly sunny, with a high near 43. Calm wind becoming south around 6 mph in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 31. Calm wind.

    Low: 31 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 49. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Rain likely. Mostly cloudy, with a low around 39. Southwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Rain Likely

  • Saturday

    Saturday: Partly sunny, with a high near 55. West wind 5 to 8 mph.

    High: 55 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of rain after 2pm. Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday Night

    Sunday Night: A chance of rain before 2am, then rain and snow likely. Mostly cloudy, with a low around 35. Chance of precipitation is 60%.

    Low: 35 °F

    Chance Rain
    then
    Rain/Snow
    Likely

  • Monday

    Monday: Rain and snow likely, mainly before 8am. Mostly cloudy, with a high near 46. Chance of precipitation is 60%.

    High: 46 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

Detailed Forecast

Today
Mostly sunny, with a high near 43. Calm wind becoming south around 6 mph in the afternoon.
Tonight
Partly cloudy, with a low around 31. Calm wind.
Friday
Mostly sunny, with a high near 49. Calm wind becoming south 5 to 8 mph in the afternoon.
Friday Night
Rain likely. Mostly cloudy, with a low around 39. Southwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Partly sunny, with a high near 55. West wind 5 to 8 mph.
Saturday Night
Mostly cloudy, with a low around 36.
Sunday
A 30 percent chance of rain after 2pm. Mostly cloudy, with a high near 54.
Sunday Night
A chance of rain before 2am, then rain and snow likely. Mostly cloudy, with a low around 35. Chance of precipitation is 60%.
Monday
Rain and snow likely, mainly before 8am. Mostly cloudy, with a high near 46. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 26.
Tuesday
Mostly sunny, with a high near 43.
Tuesday Night
Partly cloudy, with a low around 29.
Wednesday
Mostly sunny, with a high near 48.
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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:
2:26 am EDT Mar 19, 2026
Forecast Valid:
4am EDT Mar 19, 2026-6pm EDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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