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

55°F

13°C

Humidity 83%
Wind Speed SW 8 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 13 Apr 2:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Partly cloudy, with a low around 52. Southwest wind 8 to 13 mph becoming light west after midnight. Winds could gust as high as 24 mph.

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 52. South wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 75. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 75 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Light southwest wind. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a high near 72.

    High: 72 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 51.

    Low: 51 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 52. Southwest wind 8 to 13 mph becoming light west after midnight. Winds could gust as high as 24 mph.
Tuesday
Mostly sunny, with a high near 72. Calm wind becoming south 5 to 7 mph in the afternoon.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 52. South wind around 5 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 75. Calm wind becoming southwest 5 to 8 mph in the morning.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Light southwest wind. Chance of precipitation is 40%.
Thursday
Mostly cloudy, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 73.
Friday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 50.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 65.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 57.
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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:
9:09 am EDT Apr 13, 2026
Forecast Valid:
3pm EDT Apr 13, 2026-6pm EDT Apr 20, 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