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

48°F

9°C

Humidity 100%
Wind Speed Calm
Barometer 29.56 in (1001.0 mb)
Dewpoint 48°F (9°C)
Visibility 0.25 mi
Last update 12 Mar 8:56 am EDT
Extended Forecast for

3 Miles SE South Lyme CT

  • Today

    Today: Rain likely before 4pm, then rain and snow. Temperature rising to near 45 by 11am, then falling to around 38 during the remainder of the day. Northwest wind 11 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 45 °F⇓

    Rain Likely
    then
    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 30. Wind chill values between 25 and 30. Northwest wind 11 to 13 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 30 °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 14 mph becoming south in the afternoon.

    High: 43 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 40. South wind around 17 mph.

    Low: 40 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 48. Breezy, with a west wind 18 to 20 mph, with gusts as high as 30 mph.

    High: 48 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 31.

    Low: 31 °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 39. Chance of precipitation is 70%.

    Low: 39 °F

    Chance Rain
    then Rain
    Likely

  • Monday

    Monday: Rain. High near 55. Breezy. Chance of precipitation is 90%.

    High: 55 °F

    Rain and
    Breezy

Detailed Forecast

Today
Rain likely before 4pm, then rain and snow. Temperature rising to near 45 by 11am, then falling to around 38 during the remainder of the day. Northwest wind 11 to 17 mph, with gusts as high as 28 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 30. Wind chill values between 25 and 30. Northwest wind 11 to 13 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Friday
Increasing clouds, with a high near 43. Wind chill values between 25 and 35. West wind 5 to 14 mph becoming south in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 40. South wind around 17 mph.
Saturday
Sunny, with a high near 48. Breezy, with a west wind 18 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Increasing clouds, with a low around 31.
Sunday
Cloudy, with a high near 45.
Sunday Night
Rain likely, mainly after 2am. Cloudy, with a low around 39. Chance of precipitation is 70%.
Monday
Rain. High near 55. Breezy. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Cloudy, with a low around 34. Breezy. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 41.
Tuesday Night
Mostly clear, with a low around 25.
Wednesday
Mostly sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE South Lyme CT
 41.3°N 72.24°W (Elev. 0 ft)
Last Update:
7:04 am EDT Mar 12, 2026
Forecast Valid:
9am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation