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.

A Few Clouds

68°F

20°C

Humidity 90%
Wind Speed SW 9 mph
Barometer 30.19 in (1022.2 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 7 Oct 9:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Mostly sunny, with a high near 77. Southwest wind 8 to 13 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers likely, mainly after 4am. Mostly cloudy, with a low around 60. Southwest wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 60 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers, mainly before 2pm. High near 71. Southwest wind around 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 71 °F

    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming clear, with a low around 43. North wind around 8 mph, with gusts as high as 21 mph.

    Low: 43 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 60. North wind around 11 mph, with gusts as high as 21 mph.

    High: 60 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 77. Southwest wind 8 to 13 mph.
Tonight
Showers likely, mainly after 4am. Mostly cloudy, with a low around 60. Southwest wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers, mainly before 2pm. High near 71. Southwest wind around 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
Mostly cloudy, then gradually becoming clear, with a low around 43. North wind around 8 mph, with gusts as high as 21 mph.
Thursday
Sunny, with a high near 60. North wind around 11 mph, with gusts as high as 21 mph.
Thursday Night
Clear, with a low around 38.
Friday
Sunny, with a high near 63.
Friday Night
Mostly clear, with a low around 46.
Saturday
Mostly sunny, with a high near 67.
Saturday Night
Mostly cloudy, with a low around 48.
Sunday
Partly sunny, with a high near 67.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 49.
Columbus Day
A 30 percent chance of showers. Mostly sunny, with a high near 66.
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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:
6:26 am EDT Oct 7, 2025
Forecast Valid:
10am EDT Oct 7, 2025-6pm EDT Oct 13, 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