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

37°F

3°C

Humidity 65%
Wind Speed Calm
Barometer 30.11 in (1019.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 6 Apr 10:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: A chance of sprinkles before midnight, then a slight chance of rain showers between midnight and 2am, then a chance of rain and snow showers after 2am. Mostly cloudy, with a low around 37. Light east wind. Chance of precipitation is 30%.

    Low: 37 °F

    Chance
    Rain/Snow

  • Tuesday

    Tuesday: A chance of showers before 8am, then a slight chance of showers after noon. Partly sunny, with a high near 51. Light and variable wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 30%.

    High: 51 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 29. Wind chill values between 20 and 25. Northwest wind 7 to 9 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47. Wind chill values between 25 and 35 early. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 31. Calm wind.

    Low: 31 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of sprinkles before midnight, then a slight chance of rain showers between midnight and 2am, then a chance of rain and snow showers after 2am. Mostly cloudy, with a low around 37. Light east wind. Chance of precipitation is 30%.
Tuesday
A chance of showers before 8am, then a slight chance of showers after noon. Partly sunny, with a high near 51. Light and variable wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly clear, with a low around 29. Wind chill values between 20 and 25. Northwest wind 7 to 9 mph, with gusts as high as 22 mph.
Wednesday
Sunny, with a high near 47. Wind chill values between 25 and 35 early. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 31. Calm wind.
Thursday
Sunny, with a high near 51.
Thursday Night
Partly cloudy, with a low around 39.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Mostly sunny, with a high near 60.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 66.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
8:00 pm EDT Apr 6, 2026
Forecast Valid:
11pm EDT Apr 6, 2026-6pm EDT Apr 13, 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