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.

Fair

40°F

4°C

Humidity 70%
Wind Speed SW 9 mph
Barometer 30.43 in (1030.3 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 29 Mar 8:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. Southwest wind around 11 mph.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 58. Southwest wind 13 to 16 mph.

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 46. Southwest wind 5 to 11 mph.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 60. Southwest wind 6 to 10 mph.

    High: 60 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50. Southwest wind 8 to 11 mph.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely after 2pm. Partly sunny, with a high near 67. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 67 °F

    Partly Sunny
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Rain Likely

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 51.

    High: 51 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Cloudy, with a low around 39. Chance of precipitation is 60%.

    Low: 39 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 40. Southwest wind around 11 mph.
Monday
Partly sunny, with a high near 58. Southwest wind 13 to 16 mph.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 46. Southwest wind 5 to 11 mph.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 60. Southwest wind 6 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 50. Southwest wind 8 to 11 mph.
Wednesday
Rain likely after 2pm. Partly sunny, with a high near 67. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 51.
Thursday Night
Rain likely, mainly after 2am. Cloudy, with a low around 39. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 8am. Cloudy, with a high near 53. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of rain. Cloudy, with a low around 39.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 53.
Saturday Night
A 40 percent chance of rain. Cloudy, with a low around 39.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
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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:
7:43 pm EDT Mar 29, 2026
Forecast Valid:
9pm EDT Mar 29, 2026-6pm EDT Apr 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation