National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

6°F

-14°C

Humidity 69%
Wind Speed NW 3 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Last update 31 Jan 4:56 am EST
Extended Forecast for

Old Lyme CT

Cold Weather Advisory January 31, 04:59am until February 1, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory January 31, 04:59am until February 1, 10:00am

    NOW until 10:00am Sun

    Cold Weather Advisory

  • Today

    High: 21 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Increasing clouds, with a low around 10. Wind chill values between -5 and 5. Light north wind increasing to 6 to 11 mph in the evening. Winds could gust as high as 21 mph.

    Low: 10 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 26. Wind chill values between -5 and 5. North wind 14 to 18 mph, with gusts as high as 29 mph.

    High: 26 °F

    Slight Chance
    Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. Wind chill values between zero and 5. Northwest wind 9 to 14 mph.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32. Northwest wind 7 to 10 mph.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

Detailed Forecast

Today
Increasing clouds, with a high near 21. Wind chill values between -5 and 5. Northwest wind 3 to 6 mph.
Tonight
Increasing clouds, with a low around 10. Wind chill values between -5 and 5. Light north wind increasing to 6 to 11 mph in the evening. Winds could gust as high as 21 mph.
Sunday
A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 26. Wind chill values between -5 and 5. North wind 14 to 18 mph, with gusts as high as 29 mph.
Sunday Night
Mostly cloudy, with a low around 13. Wind chill values between zero and 5. Northwest wind 9 to 14 mph.
Monday
Mostly sunny, with a high near 32. Northwest wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Sunny, with a high near 33.
Tuesday Night
Partly cloudy, with a low around 16.
Wednesday
Mostly sunny, with a high near 32.
Wednesday Night
Partly cloudy, with a low around 14.
Thursday
Mostly sunny, with a high near 30.
Thursday Night
Partly cloudy, with a low around 12.
Friday
Mostly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
2:07 am EST Jan 31, 2026
Forecast Valid:
4am EST Jan 31, 2026-6pm EST Feb 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation