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

49°F

9°C

Humidity 90%
Wind Speed N 8 mph
Barometer 30.42 in (1030.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 24 Sep 4:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Mostly sunny, with a high near 67. Northeast wind 11 to 16 mph, with gusts as high as 29 mph.

    High: 67 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 50. Northeast wind 11 to 14 mph, with gusts as high as 28 mph.

    Low: 50 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers after 2pm. Mostly cloudy, with a high near 65. Breezy, with a north wind 17 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 40%.

    High: 65 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers likely, mainly after 8pm. Mostly cloudy, with a low around 52. Breezy, with a north wind 18 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Showers
    Likely and
    Breezy

  • Saturday

    Saturday: Showers. High near 63. Breezy, with a north wind around 23 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 63 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Showers. Low around 52. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Showers

  • Sunday

    Sunday: Showers. High near 65. Chance of precipitation is 80%.

    High: 65 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely, mainly before 2am. Cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely

  • Monday

    Monday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 66.

    High: 66 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 67. Northeast wind 11 to 16 mph, with gusts as high as 29 mph.
Tonight
Mostly cloudy, with a low around 50. Northeast wind 11 to 14 mph, with gusts as high as 28 mph.
Friday
A slight chance of showers before 11am, then a chance of showers after 2pm. Mostly cloudy, with a high near 65. Breezy, with a north wind 17 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 40%.
Friday Night
Showers likely, mainly after 8pm. Mostly cloudy, with a low around 52. Breezy, with a north wind 18 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Showers. High near 63. Breezy, with a north wind around 23 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Showers. Low around 52. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Showers. High near 65. Chance of precipitation is 80%.
Sunday Night
Showers likely, mainly before 2am. Cloudy, with a low around 54. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 66.
Monday Night
Mostly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 69.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Mostly sunny, with a high near 71.
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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:
3:06 am EDT Sep 24, 2026
Forecast Valid:
5am EDT Sep 24, 2026-6pm EDT Sep 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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