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

36°F

2°C

Humidity 89%
Wind Speed N 5 mph
Barometer 30.40 in (1029.5 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 6 Mar 10:56 pm EST
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Cloudy, with a low around 33. Calm wind.

    Low: 33 °F

    Cloudy

  • Saturday

    Saturday: Cloudy, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.

    High: 49 °F

    Cloudy

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Patchy dense fog. Otherwise, cloudy, with a low around 43. Southwest wind 3 to 6 mph. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    Low: 43 °F

    Chance
    Showers and
    Patchy Dense
    Fog

  • Sunday

    Sunday: A 30 percent chance of showers before 1pm. Areas of fog before 1pm. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 58. West wind 5 to 8 mph.

    High: 58 °F

    Chance
    Showers and
    Areas Fog

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 33. Calm wind.
Saturday
Cloudy, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms. Patchy dense fog. Otherwise, cloudy, with a low around 43. Southwest wind 3 to 6 mph. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Sunday
A 30 percent chance of showers before 1pm. Areas of fog before 1pm. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 58. West wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 36. Calm wind.
Monday
Sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 39.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
A 50 percent chance of rain. Cloudy, with a high near 53.
Wednesday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 28.
Friday
Mostly cloudy, with a high near 44.
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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:
12:51 pm EST Mar 6, 2026
Forecast Valid:
11pm EST Mar 6, 2026-6pm EDT Mar 13, 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