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

30°F

-1°C

Humidity 69%
Wind Speed NW 6 mph
Barometer 30.26 in (1024.7 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 24 Mar 5:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 5 to 10 mph becoming light northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 33. Southwest wind 3 to 5 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 49. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 39. Light south wind.

    Low: 39 °F

    Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 56. Southwest wind 5 to 10 mph, with gusts as high as 21 mph.

    High: 56 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 45. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Rain Likely

  • Friday

    Friday: Rain likely, mainly before 8am. Partly sunny, with a high near 51. Chance of precipitation is 60%.

    High: 51 °F

    Rain Likely
    then Chance
    Rain

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 41.

    High: 41 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 5 to 10 mph becoming light northwest in the afternoon. Winds could gust as high as 21 mph.
Tonight
Increasing clouds, with a low around 33. Southwest wind 3 to 5 mph.
Wednesday
Partly sunny, with a high near 49. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Wednesday Night
Cloudy, with a low around 39. Light south wind.
Thursday
Mostly cloudy, with a high near 56. Southwest wind 5 to 10 mph, with gusts as high as 21 mph.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 45. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain likely, mainly before 8am. Partly sunny, with a high near 51. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 28.
Sunday
Sunny, with a high near 47.
Sunday Night
Partly cloudy, with a low around 34.
Monday
Mostly sunny, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
3:49 am EDT Mar 24, 2026
Forecast Valid:
6am EDT Mar 24, 2026-6pm EDT Mar 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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