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

43°F

6°C

Humidity 97%
Wind Speed SE 9 mph
Barometer 29.42 in (996.4 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 15 Jan 12:56 am EST
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: A 40 percent chance of showers, mainly before 3am. Cloudy, with a low around 38. Light south wind.

    Low: 38 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a temperature rising to near 43 by 10am, then falling to around 36 during the remainder of the day. Light southwest wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 24 mph.

    High: 43 °F⇓

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 21. Wind chill values between 10 and 20. West wind 9 to 11 mph, with gusts as high as 29 mph.

    Low: 21 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 35. Wind chill values between 10 and 20. West wind 8 to 14 mph, with gusts as high as 30 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28. Southwest wind 3 to 5 mph.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then a chance of rain after 1pm. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.

    High: 41 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 40 percent chance of snow. Mostly cloudy, with a high near 38.

    High: 38 °F

    Chance Snow

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 21.

    Low: 21 °F

    Chance Snow

Detailed Forecast

Overnight
A 40 percent chance of showers, mainly before 3am. Cloudy, with a low around 38. Light south wind.
Thursday
Mostly cloudy, with a temperature rising to near 43 by 10am, then falling to around 36 during the remainder of the day. Light southwest wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 24 mph.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 21. Wind chill values between 10 and 20. West wind 9 to 11 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 35. Wind chill values between 10 and 20. West wind 8 to 14 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 28. Southwest wind 3 to 5 mph.
Saturday
A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then a chance of rain after 1pm. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Saturday Night
Mostly cloudy, with a low around 29.
Sunday
A 40 percent chance of snow. Mostly cloudy, with a high near 38.
Sunday Night
A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Mostly sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 12.
Wednesday
Mostly sunny, with a high near 28.
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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:
1:15 am EST Jan 15, 2026
Forecast Valid:
1am EST Jan 15, 2026-6pm EST Jan 21, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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