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

52°F

11°C

Humidity 83%
Wind Speed SE 8 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 18 Apr 3:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 46. Southeast wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Patchy Fog

  • Sunday

    Sunday: Showers, mainly before 5pm. Patchy fog before 11am. High near 56. Southeast wind 5 to 14 mph becoming northwest in the morning. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. Northwest wind around 6 mph becoming calm in the evening. Winds could gust as high as 20 mph.

    Low: 37 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 51. Northwest wind 6 to 8 mph.

    High: 51 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 32. North wind around 5 mph.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 39.

    Low: 39 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 58.

    High: 58 °F

    Mostly Cloudy

  • Wednesday Night

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

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 8pm. Otherwise, mostly cloudy, with a low around 46. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Showers, mainly before 5pm. Patchy fog before 11am. High near 56. Southeast wind 5 to 14 mph becoming northwest in the morning. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. Northwest wind around 6 mph becoming calm in the evening. Winds could gust as high as 20 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 51. Northwest wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 32. North wind around 5 mph.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Increasing clouds, with a low around 39.
Wednesday
Mostly cloudy, with a high near 58.
Wednesday Night
Mostly clear, with a low around 40.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 43.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
2:19 pm EDT Apr 18, 2026
Forecast Valid:
4pm EDT Apr 18, 2026-6pm EDT Apr 25, 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