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

64°F

18°C

Humidity 73%
Wind Speed NW 8 mph
Barometer 29.76 in (1007.6 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Oct 11:56 am EDT
Extended Forecast for

Old Lyme CT

  • Columbus Day

    Columbus Day: Sunny, with a high near 72. North wind around 7 mph.

    High: 72 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 69. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 69 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 60. Southwest wind 5 to 7 mph, with gusts as high as 20 mph.

    Low: 60 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. West wind 6 to 8 mph.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after 2am. Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers, mainly after 8am. High near 68. Chance of precipitation is 80%.

    High: 68 °F

    Showers

Detailed Forecast

Columbus Day
Sunny, with a high near 72. North wind around 7 mph.
Tonight
Mostly clear, with a low around 54. Calm wind.
Tuesday
Increasing clouds, with a high near 69. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 60. Southwest wind 5 to 7 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 76. West wind 6 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
Sunny, with a high near 67.
Thursday Night
A 50 percent chance of showers after 2am. Partly cloudy, with a low around 50.
Friday
Showers, mainly after 8am. High near 68. Chance of precipitation is 80%.
Friday Night
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 54. Breezy.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Sunny, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.36°W (Elev. 30 ft)
Last Update:
6:26 am EDT Oct 12, 2026
Forecast Valid:
12pm EDT Oct 12, 2026-6pm EDT Oct 18, 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