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

80°F

27°C

Humidity 67%
Wind Speed S 9 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 20 Aug 1:56 pm EDT
Extended Forecast for

3 Miles SSE South Lyme CT

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 81. Southwest wind around 5 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers. Low around 63. Northeast wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.

    Low: 63 °F

    Showers

  • Friday

    Friday: A 40 percent chance of showers. Mostly cloudy, with a high near 75. East wind 8 to 10 mph.

    High: 75 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 64. Northeast wind around 6 mph.

    Low: 64 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 73. East wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 73 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 66. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Showers
    Likely

  • Sunday

    Sunday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 77.

    High: 77 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 81. Southwest wind around 5 mph.
Tonight
Showers. Low around 63. Northeast wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 75. East wind 8 to 10 mph.
Friday Night
A 30 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 64. Northeast wind around 6 mph.
Saturday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 73. East wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers likely. Mostly cloudy, with a low around 66. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 77.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.
Monday
Sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE South Lyme CT
 41.28°N 72.27°W (Elev. 0 ft)
Last Update:
2:22 pm EDT Aug 20, 2026
Forecast Valid:
2pm EDT Aug 20, 2026-6pm EDT Aug 26, 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