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.

Light Rain

40°F

4°C

Humidity 86%
Wind Speed E 8 mph
Barometer 30.14 in (1020.4 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 10 Jan 3:56 pm EST
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Rain. Steady temperature around 42. East wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.

    High: 42 °F

    Rain

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog after 1am. Steady temperature around 41. East wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 41 °F

    Rain and
    Patchy Fog

  • Sunday

    Sunday: A chance of rain before 1pm, then a slight chance of rain and snow showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. Calm wind becoming northwest 5 to 8 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.

    High: 44 °F

    Chance Rain
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 9 to 11 mph, with gusts as high as 32 mph.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40. West wind 7 to 10 mph, with gusts as high as 25 mph.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Rain. Steady temperature around 42. East wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain, mainly before 4am. Patchy fog after 1am. Steady temperature around 41. East wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before 1pm, then a slight chance of rain and snow showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. Calm wind becoming northwest 5 to 8 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 9 to 11 mph, with gusts as high as 32 mph.
Monday
Mostly sunny, with a high near 40. West wind 7 to 10 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 46.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 22.
Saturday
Mostly sunny, with a high near 38.
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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:
1:33 pm EST Jan 10, 2026
Forecast Valid:
4pm EST Jan 10, 2026-6pm EST Jan 17, 2026
 
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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