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

46°F

8°C

Humidity 83%
Wind Speed Vrbl 5 mph
Barometer 30.03 in (1016.9 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 22 Apr 7:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Cloudy then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 66. Light west wind becoming northwest 6 to 11 mph in the morning. Winds could gust as high as 22 mph.

    High: 66 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 44. Light north wind.

    Low: 44 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 58 °F

    Decreasing
    Clouds

  • 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 showers after 2pm. Partly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 56.

    High: 56 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, cloudy, with a low around 41. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 66. Light west wind becoming northwest 6 to 11 mph in the morning. Winds could gust as high as 22 mph.
Thursday Night
Increasing clouds, with a low around 44. Light north wind.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind becoming northwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 39. Calm wind.
Saturday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 53.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 40.
Sunday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 56.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
A 50 percent chance of showers. Partly sunny, with a high near 59.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 59.
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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:
8:00 pm EDT Apr 22, 2026
Forecast Valid:
8pm EDT Apr 22, 2026-6pm EDT Apr 29, 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