National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

64°F

18°C

Humidity 87%
Wind Speed W 6 mph
Barometer 29.93 in (1013.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 20 May 3:56 am EDT
Extended Forecast for

Old Lyme CT

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 87. West wind 5 to 10 mph.

    High: 87 °F

    Sunny then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Calm wind. Chance of precipitation is 50%.

    Low: 57 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers before 11am. Mostly cloudy, with a high near 70. North wind around 5 mph becoming calm in the afternoon.

    High: 70 °F

    Chance
    Showers then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 67. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 67 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly after 8am. Cloudy, with a high near 63. Chance of precipitation is 70%.

    High: 63 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 50. Chance of precipitation is 70%.

    Low: 50 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 70%.

    High: 65 °F

    Showers
    Likely

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 87. West wind 5 to 10 mph.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Calm wind. Chance of precipitation is 50%.
Thursday
A 30 percent chance of showers before 11am. Mostly cloudy, with a high near 70. North wind around 5 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 50. Calm wind.
Friday
Mostly sunny, with a high near 67. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Friday Night
A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 49.
Saturday
Showers likely, mainly after 8am. Cloudy, with a high near 63. Chance of precipitation is 70%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 50. Chance of precipitation is 70%.
Sunday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 53.
Memorial Day
A 50 percent chance of showers. Mostly cloudy, with a high near 72.
Monday Night
Mostly cloudy, with a low around 56.
Tuesday
Partly sunny, with a high near 75.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
2:20 am EDT May 20, 2026
Forecast Valid:
4am EDT May 20, 2026-6pm EDT May 26, 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