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

74°F

23°C

Humidity 67%
Wind Speed W 6 mph
Barometer 29.81 in (1009.3 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 4 Sep 7:56 pm EDT
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Mostly clear, with a low around 65. North wind 3 to 8 mph.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 77. North wind 5 to 9 mph. Chance of precipitation is 30%.

    High: 77 °F

    Sunny then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 58. Light east wind.

    Low: 58 °F

    Chance
    Showers then
    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny through mid morning, then becoming sunny, with a high near 71. North wind 3 to 6 mph.

    High: 71 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 65. North wind 3 to 8 mph.
Saturday
A slight chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 77. North wind 5 to 9 mph. Chance of precipitation is 30%.
Saturday Night
A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 58. Light east wind.
Sunday
Partly sunny through mid morning, then becoming sunny, with a high near 71. North wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 55. Calm wind.
Labor Day
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 57.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Partly sunny, with a high near 76.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Sunny, with a high near 72.
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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:
2:20 pm EDT Sep 4, 2026
Forecast Valid:
8pm EDT Sep 4, 2026-6pm EDT Sep 11, 2026
 
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