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

39°F

4°C

Humidity 93%
Wind Speed W 5 mph
Barometer 29.92 in (1013.0 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 11 Nov 4:56 am EST
Extended Forecast for

Old Lyme CT

  • Veterans Day

    Veterans Day: Mostly sunny, with a high near 60. West wind 3 to 7 mph.

    High: 60 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain after 4pm. High near 59. East wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Chance Rain
    then Rain

  • Thursday Night

    Thursday Night: Rain. Low around 41. Northeast wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain

  • Friday

    Friday: Rain. High near 51. North wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

  • Saturday

    Saturday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

Veterans Day
Mostly sunny, with a high near 60. West wind 3 to 7 mph.
Tonight
Mostly cloudy, with a low around 42. Light and variable wind.
Thursday
A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain after 4pm. High near 59. East wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Rain. Low around 41. Northeast wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 51. North wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33.
Saturday
Mostly cloudy, with a high near 49.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Mostly sunny, with a high near 53.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 54.
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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:
1:20 am EST Nov 11, 2026
Forecast Valid:
5am EST Nov 11, 2026-6pm EST Nov 17, 2026
 
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Additional Resources

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Chance of Precipitation