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

30°F

-1°C

Humidity 69%
Wind Speed NE 12 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 16 Feb 4:56 am EST
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: A 40 percent chance of snow. Cloudy, with a low around 28. Light northeast wind.

    Low: 28 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: A 30 percent chance of snow before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 40. Wind chill values between 25 and 35. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 40 °F

    Chance Snow
    then Mostly
    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of snow after 4am. Mostly cloudy, with a low around 26. Calm wind.

    Low: 26 °F

    Partly Cloudy
    then Slight
    Chance Snow

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 41. Calm wind becoming southwest around 6 mph.

    High: 41 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 30. Calm wind.

    Low: 30 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain, mainly after 1pm. High near 41. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 41 °F

    Chance Rain
    then Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 4am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 70%.

    Low: 32 °F

    Rain Likely
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: A 30 percent chance of snow before 7am. Mostly cloudy, with a high near 40.

    High: 40 °F

    Chance Snow
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of snow. Cloudy, with a low around 28. Light northeast wind.
Washington's Birthday
A 30 percent chance of snow before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 40. Wind chill values between 25 and 35. Northeast wind around 6 mph becoming calm in the afternoon.
Monday Night
A 20 percent chance of snow after 4am. Mostly cloudy, with a low around 26. Calm wind.
Tuesday
Mostly cloudy, with a high near 41. Calm wind becoming southwest around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 30. Calm wind.
Wednesday
Rain, mainly after 1pm. High near 41. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain likely before 4am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 70%.
Thursday
A 30 percent chance of snow before 7am. Mostly cloudy, with a high near 40.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
Rain and snow likely, mainly after 1pm. Mostly cloudy, with a high near 40. Chance of precipitation is 60%.
Friday Night
Rain and snow likely. Mostly cloudy, with a low around 29. Chance of precipitation is 60%.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 41. Chance of precipitation is 30%.
Saturday Night
A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Sunday
A 30 percent chance of snow. Mostly cloudy, with a high near 39.
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:
2:01 am EST Feb 16, 2026
Forecast Valid:
5am EST Feb 16, 2026-6pm EST Feb 22, 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