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

47°F

8°C

Humidity 93%
Wind Speed N 8 mph
Barometer 30.44 in (1030.8 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 24 Sep 1:56 am EDT
Extended Forecast for

Old Lyme CT

  • Overnight

    Overnight: Mostly clear, with a low around 50. Northeast wind around 16 mph.

    Low: 50 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 67. Northeast wind around 18 mph, with gusts as high as 28 mph.

    High: 67 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 50. Northeast wind 15 to 17 mph, with gusts as high as 28 mph.

    Low: 50 °F

    Mostly Cloudy

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 65. Breezy, with a north wind 20 to 22 mph, with gusts as high as 33 mph.

    High: 65 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers likely. Cloudy, with a low around 53. Breezy, with a north wind around 21 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 53 °F

    Showers
    Likely and
    Breezy

  • Saturday

    Saturday: Showers likely. Mostly cloudy, with a high near 64. Breezy. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 64 °F

    Showers
    Likely and
    Breezy

  • Saturday Night

    Saturday Night: Showers likely. Cloudy, with a low around 53. Chance of precipitation is 70%.

    Low: 53 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely. Mostly cloudy, with a high near 65. Breezy. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 50. Northeast wind around 16 mph.
Thursday
Mostly sunny, with a high near 67. Northeast wind around 18 mph, with gusts as high as 28 mph.
Thursday Night
Mostly cloudy, with a low around 50. Northeast wind 15 to 17 mph, with gusts as high as 28 mph.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 65. Breezy, with a north wind 20 to 22 mph, with gusts as high as 33 mph.
Friday Night
Showers likely. Cloudy, with a low around 53. Breezy, with a north wind around 21 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Showers likely. Mostly cloudy, with a high near 64. Breezy. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Showers likely. Cloudy, with a low around 53. Chance of precipitation is 70%.
Sunday
Showers likely. Mostly cloudy, with a high near 65. Breezy. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 53.
Monday
Partly sunny, with a high near 67.
Monday Night
Mostly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 69.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
5:46 pm EDT Sep 23, 2026
Forecast Valid:
2am EDT Sep 24, 2026-6pm EDT Sep 30, 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