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.

Fair

68°F

20°C

Humidity 21%
Wind Speed NW 15 G 32 mph
Barometer 29.78 in (1008.3 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 23 Apr 4:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Northwest wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 20 mph.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of rain before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.

    High: 61 °F

    Slight Chance
    Rain then
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39. Calm wind.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of rain, mainly after 2pm. Partly sunny, with a high near 51. Southeast wind 5 to 9 mph.

    High: 51 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm in the evening.

    Low: 41 °F

    Chance Rain

  • Sunday

    Sunday: A 40 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. Northwest wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 20 mph.
Friday
A 20 percent chance of rain before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 39. Calm wind.
Saturday
A 30 percent chance of rain, mainly after 2pm. Partly sunny, with a high near 51. Southeast wind 5 to 9 mph.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm in the evening.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 58.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 46.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 59.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of showers. Mostly cloudy, with a high near 62.
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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:
2:07 pm EDT Apr 23, 2026
Forecast Valid:
5pm EDT Apr 23, 2026-6pm EDT Apr 30, 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