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.

A Few Clouds

65°F

18°C

Humidity 93%
Wind Speed SW 7 mph
Barometer 29.82 in (1009.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 14 Oct 1:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Mostly clear, with a low around 62. Southwest wind around 9 mph.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 78. West wind around 9 mph.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48. Northwest wind 3 to 6 mph.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 64. North wind 3 to 7 mph.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely after 2am. Increasing clouds, with a low around 48. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 48 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers. High near 70. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 70 °F

    Showers

  • Friday Night

    Friday Night: Showers likely before 2am. Mostly cloudy, with a low around 39. Chance of precipitation is 70%.

    Low: 39 °F

    Showers
    Likely

  • Saturday

    Saturday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 62. Southwest wind around 9 mph.
Wednesday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 78. West wind around 9 mph.
Wednesday Night
Mostly clear, with a low around 48. Northwest wind 3 to 6 mph.
Thursday
Sunny, with a high near 64. North wind 3 to 7 mph.
Thursday Night
Showers likely after 2am. Increasing clouds, with a low around 48. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 60%.
Friday
Showers. High near 70. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Showers likely before 2am. Mostly cloudy, with a low around 39. Chance of precipitation is 70%.
Saturday
Sunny, with a high near 53.
Saturday Night
Mostly clear, with a low around 35.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 66.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.33°N 72.32°W (Elev. 56 ft)
Last Update:
1:52 am EDT Oct 14, 2026
Forecast Valid:
2am EDT Oct 14, 2026-6pm EDT Oct 20, 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