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

32°F

0°C

Humidity 75%
Wind Speed NW 7 mph
Barometer 29.87 in (1011.5 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 15 Nov 5:56 am EST
Extended Forecast for

Old Lyme CT

  • Today

    Today: Areas of frost before 9am. Otherwise, increasing clouds, with a high near 55. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 55 °F

    Areas Frost
    then
    Increasing
    Clouds

  • Tonight

    Tonight: Showers, mainly before 4am. Temperature rising to around 51 by 1am. Light southwest wind becoming west 5 to 9 mph in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 44 °F⇑

    Showers

  • Sunday

    Sunday: Partly sunny, with a temperature rising to near 54 by 10am, then falling to around 46 during the remainder of the day. West wind 10 to 17 mph, with gusts as high as 30 mph.

    High: 54 °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 32 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 32.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of frost before 9am. Otherwise, increasing clouds, with a high near 55. Light and variable wind becoming west 5 to 7 mph in the morning.
Tonight
Showers, mainly before 4am. Temperature rising to around 51 by 1am. Light southwest wind becoming west 5 to 9 mph in the evening. Winds could gust as high as 22 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 54 by 10am, then falling to around 46 during the remainder of the day. West wind 10 to 17 mph, with gusts as high as 30 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 32 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 32.
Tuesday
Sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 31.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 50.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 39.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 55.
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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:
5:10 am EST Nov 15, 2025
Forecast Valid:
6am EST Nov 15, 2025-6pm EST Nov 21, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation