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.

Fog/Mist

48°F

9°C

Humidity 96%
Wind Speed S 7 mph
Barometer 29.75 in (1007.4 mb)
Dewpoint 47°F (8°C)
Visibility 4.00 mi
Wind Chill45°F (7°C)
Last update 30 Apr 10:56 am EDT
Extended Forecast for

Old Lyme CT

  • Today

    Today: A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 58. Light south wind.

    High: 58 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 43. Calm wind becoming northwest around 5 mph after midnight.

    Low: 43 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 62. West wind 6 to 10 mph.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 2am. Increasing clouds, with a low around 44. West wind around 5 mph becoming calm in the evening.

    Low: 44 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 58. Calm wind becoming south around 6 mph in the afternoon.

    High: 58 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 58. Light south wind.
Tonight
Partly cloudy, with a low around 43. Calm wind becoming northwest around 5 mph after midnight.
Friday
Sunny, with a high near 62. West wind 6 to 10 mph.
Friday Night
A 20 percent chance of showers after 2am. Increasing clouds, with a low around 44. West wind around 5 mph becoming calm in the evening.
Saturday
A 40 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 58. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 42.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 41.
Monday
Sunny, with a high near 61.
Monday Night
Partly cloudy, with a low around 49.
Tuesday
Mostly sunny, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 66.
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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:
4:33 am EDT Apr 30, 2026
Forecast Valid:
11am EDT Apr 30, 2026-6pm EDT May 6, 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