National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fog/Mist

41°F

5°C

Humidity 100%
Wind Speed Vrbl 5 mph
Barometer 29.83 in (1010.0 mb)
Dewpoint 41°F (5°C)
Visibility 2.50 mi
Wind Chill38°F (3°C)
Last update 8 Mar 1:56 am EDT
Extended Forecast for

South Lyme CT

Dense Fog Advisory March 8, 01:12am until March 8, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory March 8, 01:12am until March 8, 09:00am

    NOW until 9:00am Sun

    Dense Fog Advisory

  • Overnight

    Low: 44 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 10am. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 57. Southwest wind 6 to 8 mph.

    High: 57 °F

    Chance
    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. Light west wind.

    Low: 35 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 56. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. Light southwest wind.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 55.

    High: 55 °F

    Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers. Areas of dense fog. Otherwise, cloudy, with a steady temperature around 44. Southwest wind around 8 mph.
Sunday
A 30 percent chance of showers, mainly before 10am. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 57. Southwest wind 6 to 8 mph.
Sunday Night
Partly cloudy, with a low around 35. Light west wind.
Monday
Sunny, with a high near 56. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Monday Night
Mostly clear, with a low around 35. Light southwest wind.
Tuesday
Mostly sunny, with a high near 58.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Cloudy, with a high near 55.
Wednesday Night
A 30 percent chance of showers after 1am. Cloudy, with a low around 45.
Thursday
Showers likely. Cloudy, with a high near 52. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 35.
Saturday
Sunny, with a high near 49.
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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:
12:47 am EST Mar 8, 2026
Forecast Valid:
1am EST Mar 8, 2026-6pm EDT Mar 14, 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