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

41°F

5°C

Humidity 67%
Wind Speed W 18 G 29 mph
Barometer 29.91 in (1012.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 9 Dec 11:56 pm EST
Extended Forecast for

Old Lyme CT

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 35. Southwest wind around 9 mph, with gusts as high as 23 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely after 1pm. Mostly cloudy, with a high near 47. Wind chill values between 25 and 35 early. Southwest wind 9 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 47 °F

    Partly Sunny
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: Rain likely, mainly before 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 30. Southwest wind 10 to 13 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 30 °F

    Rain Likely

  • Thursday

    Thursday: Mostly sunny, with a steady temperature around 33. Wind chill values between 20 and 25. West wind 13 to 17 mph, with gusts as high as 32 mph.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 22. West wind 10 to 15 mph, with gusts as high as 33 mph.

    Low: 22 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 42.

    High: 42 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 35. Southwest wind around 9 mph, with gusts as high as 23 mph.
Wednesday
Rain likely after 1pm. Mostly cloudy, with a high near 47. Wind chill values between 25 and 35 early. Southwest wind 9 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain likely, mainly before 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 30. Southwest wind 10 to 13 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Mostly sunny, with a steady temperature around 33. Wind chill values between 20 and 25. West wind 13 to 17 mph, with gusts as high as 32 mph.
Thursday Night
Mostly clear, with a low around 22. West wind 10 to 15 mph, with gusts as high as 33 mph.
Friday
Mostly sunny, with a high near 37.
Friday Night
Mostly cloudy, with a low around 25.
Saturday
Mostly cloudy, with a high near 42.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 27.
Sunday
A chance of snow before noon, then a chance of rain and snow between noon and 3pm, then a chance of snow after 3pm. Mostly cloudy, with a high near 37. Chance of precipitation is 40%.
Sunday Night
Mostly clear, with a low around 16.
Monday
Sunny, with a high near 30.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 34.
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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:
5:42 pm EST Dec 9, 2025
Forecast Valid:
12am EST Dec 10, 2025-6pm EST Dec 16, 2025
 
Forecast Discussion
 
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Additional Resources

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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