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

76°F

24°C

Humidity 50%
Wind Speed SE 10 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 24 Jul 3:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Partly cloudy, with a low around 58. South wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 79. North wind 5 to 9 mph becoming southeast in the afternoon.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57. East wind around 5 mph becoming calm.

    Low: 57 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. North wind 7 to 11 mph becoming east in the afternoon.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. South wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 79. North wind 5 to 9 mph becoming southeast in the afternoon.
Saturday Night
Mostly clear, with a low around 57. East wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 81. North wind 7 to 11 mph becoming east in the afternoon.
Sunday Night
Mostly clear, with a low around 59. Light and variable wind.
Monday
Sunny, with a high near 81.
Monday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 65.
Tuesday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
A 50 percent chance of showers. Partly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Partly cloudy, with a low around 65.
Friday
Sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.35°N 72.29°W (Elev. 98 ft)
Last Update:
2:50 pm EDT Jul 24, 2026
Forecast Valid:
4pm EDT Jul 24, 2026-6pm EDT Jul 31, 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