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.

Rain Fog/Mist

40°F

4°C

Humidity 97%
Wind Speed E 10 G 24 mph
Barometer 30.00 in (1015.7 mb)
Dewpoint 39°F (4°C)
Visibility 4.00 mi
Wind Chill34°F (1°C)
Last update 10 Jan 7:56 pm EST
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Rain, mainly before 4am. Areas of fog after 1am. Low around 38. East wind 5 to 14 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Rain and
    Areas Fog

  • Sunday

    Sunday: A chance of rain before 1pm, then a chance of snow showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. Light northwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.

    High: 44 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers, mainly before 7pm. Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 9 to 15 mph, with gusts as high as 29 mph.

    Low: 28 °F

    Chance Snow
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40. Wind chill values between 20 and 30. West wind 7 to 10 mph, with gusts as high as 25 mph.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30. Southwest wind around 6 mph.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Chance Rain

Detailed Forecast

Tonight
Rain, mainly before 4am. Areas of fog after 1am. Low around 38. East wind 5 to 14 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before 1pm, then a chance of snow showers after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 44. Light northwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.
Sunday Night
A 30 percent chance of snow showers, mainly before 7pm. Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 9 to 15 mph, with gusts as high as 29 mph.
Monday
Mostly sunny, with a high near 40. Wind chill values between 20 and 30. West wind 7 to 10 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 30. Southwest wind around 6 mph.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 22.
Saturday
Mostly sunny, with a high near 38.
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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:
8:12 pm EST Jan 10, 2026
Forecast Valid:
8pm EST Jan 10, 2026-6pm EST Jan 17, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation