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

South Lyme CT

  • This Afternoon

    This Afternoon: Rain likely before 4pm, then rain and snow. Temperature falling to around 35 by 5pm. Northwest wind 13 to 15 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 47 °F⇓

    Rain/Snow

  • Tonight

    Tonight: 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: A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 8 mph, with gusts as high as 23 mph.

    Low: 36 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 49. West wind 10 to 13 mph, with gusts as high as 26 mph.

    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

  • Monday

    Monday: Rain. High near 57. Chance of precipitation is 90%.

    High: 57 °F

    Rain

Detailed Forecast

This Afternoon
Rain likely before 4pm, then rain and snow. Temperature falling to around 35 by 5pm. Northwest wind 13 to 15 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 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
A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind around 8 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 49. West wind 10 to 13 mph, with gusts as high as 26 mph.
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, mainly before 2am. 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:
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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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation