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

40°F

4°C

Humidity 58%
Wind Speed NW 15 G 25 mph
Barometer 29.73 in (1006.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 12 Mar 3:56 pm EDT
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Snow. Steady temperature around 36. Northwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than a half inch possible.

    High: 36 °F

    Snow

  • Tonight

    Tonight: Snow, mainly before 8pm. Low around 28. Northwest wind 6 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Snow then
    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 45. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 21 mph.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A 20 percent chance of rain before 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 9 mph, with gusts as high as 28 mph.

    Low: 36 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Sunny, with a high near 48. West wind 13 to 16 mph, with gusts as high as 31 mph.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 29.

    Low: 29 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain likely after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Mostly Cloudy
    then Rain
    Likely

  • Monday

    Monday: Rain and possibly a thunderstorm. High near 57. Chance of precipitation is 100%.

    High: 57 °F

    Rain

Detailed Forecast

This Afternoon
Snow. Steady temperature around 36. Northwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow, mainly before 8pm. Low around 28. Northwest wind 6 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Friday
Increasing clouds, with a high near 45. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 21 mph.
Friday Night
A 20 percent chance of rain before 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 9 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 48. West wind 13 to 16 mph, with gusts as high as 31 mph.
Saturday Night
Increasing clouds, with a low around 29.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
Rain likely after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.
Monday
Rain and possibly a thunderstorm. High near 57. Chance of precipitation is 100%.
Monday Night
Rain, mainly before 2am. Low around 36. Chance of precipitation is 90%.
Tuesday
A 30 percent chance of rain. Partly sunny, with a high near 46.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 38.
Wednesday Night
Partly cloudy, with a low around 26.
Thursday
Mostly sunny, with a high near 42.
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:
3:03 pm EDT Mar 12, 2026
Forecast Valid:
4pm EDT Mar 12, 2026-6pm EDT Mar 19, 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