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

69°F

21°C

Humidity 55%
Wind Speed N 9 mph
Barometer 29.87 in (1011.5 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 11 Sep 1:56 am EDT
Extended Forecast for

Old Lyme CT

  • Overnight

    Overnight: Partly cloudy, with a steady temperature around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 78. Northwest wind 3 to 5 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. Calm wind.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 76. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely after 2am. Mostly cloudy, with a low around 65. Light south wind. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 65 °F

    Mostly Cloudy
    then Showers
    Likely

  • Sunday

    Sunday: Showers likely before 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 79 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a steady temperature around 66. Calm wind.
Friday
Sunny, with a high near 78. Northwest wind 3 to 5 mph.
Friday Night
Mostly clear, with a low around 56. Calm wind.
Saturday
Mostly sunny, with a high near 76. Calm wind becoming southeast around 6 mph in the afternoon.
Saturday Night
Showers likely after 2am. Mostly cloudy, with a low around 65. Light south wind. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Showers likely before 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Partly cloudy, with a low around 62.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 77.
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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:
9:48 pm EDT Sep 10, 2026
Forecast Valid:
2am EDT Sep 11, 2026-6pm EDT Sep 17, 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