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

24°F

-4°C

Humidity 29%
Wind Speed Calm
Barometer 30.23 in (1023.6 mb)
Dewpoint -4°F (-20°C)
Visibility 10.00 mi
Last update 9 Dec 10:56 am EST
Extended Forecast for

Old Lyme CT

  • Today

    Today: Increasing clouds, with a high near 33. Wind chill values between 20 and 25. Light and variable wind becoming southwest around 6 mph in the afternoon.

    High: 33 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A slight chance of rain between 10pm and 1am. Mostly cloudy, with a temperature rising to around 35 by 1am. Southwest wind 6 to 8 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    Low: 28 °F⇑

    Slight Chance
    Rain

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. South wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 30. Southwest wind 7 to 11 mph, with gusts as high as 25 mph.

    Low: 30 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 39. West wind 9 to 14 mph, with gusts as high as 26 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 37.

    High: 37 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 33. Wind chill values between 20 and 25. Light and variable wind becoming southwest around 6 mph in the afternoon.
Tonight
A slight chance of rain between 10pm and 1am. Mostly cloudy, with a temperature rising to around 35 by 1am. Southwest wind 6 to 8 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. South wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 30. Southwest wind 7 to 11 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 39. West wind 9 to 14 mph, with gusts as high as 26 mph.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Sunny, with a high near 37.
Friday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Saturday
Partly sunny, with a high near 40.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 24.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 34.
Sunday Night
Mostly clear, with a low around 15.
Monday
Sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
5:28 am EST Dec 9, 2025
Forecast Valid:
11am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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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