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

49°F

9°C

Humidity 55%
Wind Speed W 8 mph
Barometer 29.71 in (1006.1 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 9 Nov 6:56 am EST
Extended Forecast for

South Lyme CT

  • Today

    Today: A slight chance of sprinkles before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. Northwest wind 10 to 16 mph, with gusts as high as 28 mph.

    High: 59 °F

    Slight Chance
    Sprinkles

  • Tonight

    Tonight: Mostly clear, with a low around 37. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy, then becoming sunny during the afternoon, with a high near 60. West wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 60 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 41. West wind around 6 mph.

    Low: 41 °F

    Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 60. West wind 5 to 8 mph.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 40. Chance of precipitation is 80%.

    Low: 40 °F

    Rain

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 54. Chance of precipitation is 70%.

    High: 54 °F

    Rain Likely

Detailed Forecast

Today
A slight chance of sprinkles before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. Northwest wind 10 to 16 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 37. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, then becoming sunny during the afternoon, with a high near 60. West wind 6 to 11 mph, with gusts as high as 21 mph.
Tuesday Night
Clear, with a low around 41. West wind around 6 mph.
Veterans Day
Sunny, with a high near 60. West wind 5 to 8 mph.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.
Thursday Night
Rain. Low around 40. Chance of precipitation is 80%.
Friday
Rain likely. Mostly cloudy, with a high near 54. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 34.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 51.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
Mostly sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
6:46 am EST Nov 9, 2026
Forecast Valid:
7am EST Nov 9, 2026-6pm EST Nov 15, 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