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

46°F

8°C

Humidity 50%
Wind Speed SW 13 mph
Barometer 29.72 in (1006.5 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 15 Nov 12:56 pm EST
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Mostly sunny, with a steady temperature around 49. Southwest wind around 6 mph.

    High: 49 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly before 4am. Temperature falling to near 43 by 8pm, then rising to around 51 during the remainder of the night. Light south wind becoming southwest 5 to 9 mph in the evening. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 43 °F⇑

    Showers

  • Sunday

    Sunday: Partly sunny, with a temperature rising to near 56 by 10am, then falling to around 45 during the remainder of the day. West wind 10 to 16 mph, with gusts as high as 34 mph.

    High: 56 °F⇓

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 32. Wind chill values between 25 and 30. West wind 10 to 14 mph, with gusts as high as 31 mph.

    Low: 32 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 46. West wind 13 to 16 mph, with gusts as high as 29 mph.

    High: 46 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a steady temperature around 49. Southwest wind around 6 mph.
Tonight
Showers, mainly before 4am. Temperature falling to near 43 by 8pm, then rising to around 51 during the remainder of the night. Light south wind becoming southwest 5 to 9 mph in the evening. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Partly sunny, with a temperature rising to near 56 by 10am, then falling to around 45 during the remainder of the day. West wind 10 to 16 mph, with gusts as high as 34 mph.
Sunday Night
Partly cloudy, with a low around 32. Wind chill values between 25 and 30. West wind 10 to 14 mph, with gusts as high as 31 mph.
Monday
Mostly sunny, with a high near 46. West wind 13 to 16 mph, with gusts as high as 29 mph.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 32.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Mostly sunny, with a high near 50.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 36.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
1:22 pm EST Nov 15, 2025
Forecast Valid:
1pm EST Nov 15, 2025-6pm EST Nov 21, 2025
 
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Additional Resources

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Chance of Precipitation