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

68°F

20°C

Humidity 73%
Wind Speed E 12 mph
Barometer 30.11 in (1019.4 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 26 Jun 12:56 pm EDT
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Cloudy, with a high near 70. East wind around 10 mph.

    High: 70 °F

    Cloudy

  • Tonight

    Tonight: A 20 percent chance of showers. Mostly cloudy, with a low around 61. East wind 5 to 10 mph.

    Low: 61 °F

    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 71. East wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 71 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers, then a chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 61. East wind 5 to 7 mph. Chance of precipitation is 40%.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 76. East wind 5 to 7 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Cloudy, with a high near 70. East wind around 10 mph.
Tonight
A 20 percent chance of showers. Mostly cloudy, with a low around 61. East wind 5 to 10 mph.
Friday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 71. East wind 7 to 10 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers, then a chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 61. East wind 5 to 7 mph. Chance of precipitation is 40%.
Saturday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 76. East wind 5 to 7 mph. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.
Sunday
Mostly cloudy, with a high near 79.
Sunday Night
Mostly cloudy, with a low around 63.
Monday
Partly sunny, with a high near 81.
Monday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 67.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 85.
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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:
12:24 pm EDT Jun 26, 2025
Forecast Valid:
1pm EDT Jun 26, 2025-6pm EDT Jul 2, 2025
 
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