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.

Light Rain Fog/Mist

33°F

1°C

Humidity 96%
Wind Speed Calm
Barometer 30.17 in (1021.7 mb)
Dewpoint 32°F (0°C)
Visibility 6.00 mi
Last update 3 Mar 10:56 pm EST
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog. Low around 34. Light and variable wind. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 34 °F

    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 50. Calm wind.

    High: 50 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: A slight chance of freezing rain after 4am. Partly cloudy, with a low around 29. Calm wind. Chance of precipitation is 20%.

    Low: 29 °F

    Partly Cloudy
    then Slight
    Chance
    Freezing Rain

  • Thursday

    Thursday: A chance of rain or freezing rain before 7am, then a chance of rain. Cloudy, with a high near 43. Light east wind. Chance of precipitation is 50%.

    High: 43 °F

    Chance
    Rain/Freezing
    Rain then
    Chance Rain

  • Thursday Night

    Thursday Night: Rain. Low around 35. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 35 °F

    Rain

  • Friday

    Friday: A 40 percent chance of rain before 1pm. Mostly cloudy, with a high near 46.

    High: 46 °F

    Chance Rain

  • Friday Night

    Friday Night: Cloudy, with a low around 34.

    Low: 34 °F

    Cloudy

  • Saturday

    Saturday: Cloudy, with a high near 51.

    High: 51 °F

    Cloudy

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.

    Low: 44 °F

    Showers
    Likely

Detailed Forecast

Tonight
Rain, mainly before 4am. Patchy fog. Low around 34. Light and variable wind. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 50. Calm wind.
Wednesday Night
A slight chance of freezing rain after 4am. Partly cloudy, with a low around 29. Calm wind. Chance of precipitation is 20%.
Thursday
A chance of rain or freezing rain before 7am, then a chance of rain. Cloudy, with a high near 43. Light east wind. Chance of precipitation is 50%.
Thursday Night
Rain. Low around 35. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 40 percent chance of rain before 1pm. Mostly cloudy, with a high near 46.
Friday Night
Cloudy, with a low around 34.
Saturday
Cloudy, with a high near 51.
Saturday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Sunny, with a high near 56.
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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:
7:28 pm EST Mar 3, 2026
Forecast Valid:
11pm EST Mar 3, 2026-6pm EDT Mar 10, 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