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.

Overcast

66°F

19°C

Humidity 78%
Wind Speed N 10 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 3 Oct 12:56 am EDT
Extended Forecast for

Old Lyme CT

  • Overnight

    Overnight: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 56. North wind around 6 mph.

    Low: 56 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 71. Northeast wind around 8 mph.

    High: 71 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 51. East wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Clear

  • Sunday

    Sunday: A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 64. East wind 6 to 9 mph.

    High: 64 °F

    Sunny then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 53. Light east wind.

    Low: 53 °F

    Chance
    Showers

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 69.

    High: 69 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 43.

    Low: 43 °F

    Clear

Detailed Forecast

Overnight
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 56. North wind around 6 mph.
Saturday
Sunny, with a high near 71. Northeast wind around 8 mph.
Saturday Night
Clear, with a low around 51. East wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 64. East wind 6 to 9 mph.
Sunday Night
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 53. Light east wind.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 69.
Monday Night
Clear, with a low around 45.
Tuesday
Sunny, with a high near 60.
Tuesday Night
Clear, with a low around 43.
Wednesday
Sunny, with a high near 61.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 51.
Friday
Sunny, with a high near 67.
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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:
2:54 pm EDT Oct 2, 2026
Forecast Valid:
1am EDT Oct 3, 2026-6pm EDT Oct 9, 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