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

46°F

8°C

Humidity 96%
Wind Speed W 6 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 45°F (7°C)
Visibility 8.00 mi
Wind Chill43°F (6°C)
Last update 9 Jan 10:56 pm EST
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. Southwest wind around 6 mph becoming light and variable after midnight.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after 4pm. High near 45. Calm wind becoming northeast around 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 45 °F

    Partly Sunny
    then Rain

  • Saturday Night

    Saturday Night: Rain. Low around 36. East wind around 6 mph becoming calm after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 36 °F

    Rain

  • Sunday

    Sunday: A 40 percent chance of rain, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. West wind 5 to 13 mph.

    High: 44 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 26. West wind 10 to 13 mph, with gusts as high as 30 mph.

    Low: 26 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 39.

    High: 39 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 37. Southwest wind around 6 mph becoming light and variable after midnight.
Saturday
Rain, mainly after 4pm. High near 45. Calm wind becoming northeast around 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain. Low around 36. East wind around 6 mph becoming calm after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 40 percent chance of rain, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. West wind 5 to 13 mph.
Sunday Night
Partly cloudy, with a low around 26. West wind 10 to 13 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Mostly cloudy, with a high near 40.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 22.
Friday
Partly sunny, with a high near 33.
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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:
6:02 pm EST Jan 9, 2026
Forecast Valid:
11pm EST Jan 9, 2026-6pm EST Jan 16, 2026
 
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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