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/Mist

47°F

8°C

Humidity 97%
Wind Speed S 12 mph
Barometer 29.60 in (1002.2 mb)
Dewpoint 46°F (8°C)
Visibility 2.00 mi
Wind Chill42°F (6°C)
Last update 12 Mar 2:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Rain likely, mainly before 5am. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 49. South wind around 7 mph. Chance of precipitation is 60%.

    Low: 49 °F

    Rain Likely
    and Patchy
    Fog

  • Thursday

    Thursday: Rain likely before 4pm, then rain and snow. Patchy fog before 8am. Temperature falling to around 39 by 5pm. Northwest wind 7 to 16 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 46 °F⇓

    Rain Likely
    and Patchy
    Fog then
    Rain/Snow

  • Thursday Night

    Thursday Night: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 28. Northwest wind around 6 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 28 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 44. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 44 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. South wind around 8 mph, with gusts as high as 23 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Saturday Night

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

    Low: 30 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain likely, mainly after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Chance Rain
    then Rain
    Likely

Detailed Forecast

Overnight
Rain likely, mainly before 5am. Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 49. South wind around 7 mph. Chance of precipitation is 60%.
Thursday
Rain likely before 4pm, then rain and snow. Patchy fog before 8am. Temperature falling to around 39 by 5pm. Northwest wind 7 to 16 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Thursday Night
Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 28. Northwest wind around 6 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Friday
Increasing clouds, with a high near 44. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. South wind around 8 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 49.
Saturday Night
Increasing clouds, with a low around 30.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
Rain likely, mainly after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.
Monday
Rain. High near 57. Chance of precipitation is 90%.
Monday Night
Rain likely. Cloudy, with a low around 32. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 43.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Mostly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
2:50 am EDT Mar 12, 2026
Forecast Valid:
3am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation