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 68%
Wind Speed S 12 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 22 Apr 3:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Showers likely, mainly after 5am. Mostly cloudy, with a low around 39. South wind around 6 mph. Chance of precipitation is 60%.

    Low: 39 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 11am. Cloudy, with a high near 49. Southeast wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 49 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 65. Calm wind becoming northwest 5 to 9 mph in the morning. Winds could gust as high as 21 mph.

    High: 65 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 43. Light north wind.

    Low: 43 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers likely, mainly after 5am. Mostly cloudy, with a low around 39. South wind around 6 mph. Chance of precipitation is 60%.
Wednesday
Showers likely, mainly before 11am. Cloudy, with a high near 49. Southeast wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 40. Calm wind.
Thursday
Mostly sunny, with a high near 65. Calm wind becoming northwest 5 to 9 mph in the morning. Winds could gust as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 43. Light north wind.
Friday
Mostly sunny, with a high near 59.
Friday Night
Mostly clear, with a low around 40.
Saturday
Partly sunny, with a high near 55.
Saturday Night
Mostly cloudy, with a low around 39.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 59.
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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:
2:25 am EDT Apr 22, 2026
Forecast Valid:
4am EDT Apr 22, 2026-6pm EDT Apr 28, 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