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.

A Few Clouds

66°F

19°C

Humidity 29%
Wind Speed NW 15 G 25 mph
Barometer 29.84 in (1010.6 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 23 Apr 12:56 pm EDT
Extended Forecast for

Old Lyme CT

  • This Afternoon

    This Afternoon: Sunny, with a high near 68. Northwest wind around 11 mph, with gusts as high as 22 mph.

    High: 68 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. Light north wind.

    Low: 43 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon.

    High: 60 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: A 50 percent chance of rain. Partly sunny, with a high near 52. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 52 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance Rain

  • Sunday

    Sunday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 68. Northwest wind around 11 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, with a low around 43. Light north wind.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 40. Calm wind.
Saturday
A 50 percent chance of rain. Partly sunny, with a high near 52. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
A 50 percent chance of showers. Partly sunny, with a high near 58.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 58.
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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:
10:32 am EDT Apr 23, 2026
Forecast Valid:
1pm EDT Apr 23, 2026-6pm EDT Apr 29, 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