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

43°F

6°C

Humidity 65%
Wind Speed NW 15 G 31 mph
Barometer 29.67 in (1004.6 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 12 Mar 11:56 am EDT
Extended Forecast for

3 Miles SE Old Lyme CT

  • This Afternoon

    This Afternoon: Rain likely before 4pm, then rain and snow. Temperature falling to around 36 by 5pm. Northwest wind 14 to 16 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 45 °F⇓

    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 29. Northwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 43. Wind chill values between 25 and 35. West wind 5 to 13 mph becoming south in the afternoon.

    High: 43 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 40. South wind 11 to 13 mph, with gusts as high as 24 mph.

    Low: 40 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 48. West wind around 15 mph, with gusts as high as 28 mph.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 30.

    Low: 30 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 45.

    High: 45 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain likely, mainly after 2am. Cloudy, with a low around 38. Chance of precipitation is 70%.

    Low: 38 °F

    Chance Rain
    then Rain
    Likely

  • Monday

    Monday: Rain. High near 56. Chance of precipitation is 90%.

    High: 56 °F

    Rain

Detailed Forecast

This Afternoon
Rain likely before 4pm, then rain and snow. Temperature falling to around 36 by 5pm. Northwest wind 14 to 16 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 29. Northwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Friday
Increasing clouds, with a high near 43. Wind chill values between 25 and 35. West wind 5 to 13 mph becoming south in the afternoon.
Friday Night
A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 40. South wind 11 to 13 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 48. West wind around 15 mph, with gusts as high as 28 mph.
Saturday Night
Increasing clouds, with a low around 30.
Sunday
Cloudy, with a high near 45.
Sunday Night
Rain likely, mainly after 2am. Cloudy, with a low around 38. Chance of precipitation is 70%.
Monday
Rain. High near 56. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Cloudy, with a low around 33. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 42.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Mostly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Old Lyme CT
 41.28°N 72.3°W (Elev. 0 ft)
Last Update:
11:29 am EDT Mar 12, 2026
Forecast Valid:
12pm EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation