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 Calm
Barometer 30.18 in (1022.1 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 20 Nov 7:56 pm EST
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Areas of frost after 11pm. Otherwise, mostly clear, with a low around 34. Light and variable wind.

    Low: 34 °F

    Areas Frost

  • Friday

    Friday: Areas of frost before 8am. Otherwise, mostly cloudy, with a high near 54. Light and variable wind becoming southwest 5 to 10 mph in the morning.

    High: 54 °F

    Areas Frost
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 40 percent chance of rain. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Chance Rain
    and Patchy
    Fog

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 50. North wind 5 to 10 mph.

    High: 50 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 29. North wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

Detailed Forecast

Tonight
Areas of frost after 11pm. Otherwise, mostly clear, with a low around 34. Light and variable wind.
Friday
Areas of frost before 8am. Otherwise, mostly cloudy, with a high near 54. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Friday Night
A 40 percent chance of rain. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 39. Calm wind.
Saturday
A 30 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 50. North wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 29. North wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 48.
Sunday Night
Partly cloudy, with a low around 34.
Monday
Sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 34.
Tuesday
A 30 percent chance of rain after 1pm. Cloudy, with a high near 54.
Tuesday Night
Rain. Low around 45. Chance of precipitation is 80%.
Wednesday
A 50 percent chance of rain. Mostly cloudy, with a high near 60.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 41.
Thanksgiving Day
Mostly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.36°W (Elev. 30 ft)
Last Update:
12:38 pm EST Nov 20, 2025
Forecast Valid:
8pm EST Nov 20, 2025-6pm EST Nov 27, 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