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.

Fair

34°F

1°C

Humidity 73%
Wind Speed Calm
Barometer 30.48 in (1032.0 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 12 Apr 5:56 am EDT
Extended Forecast for

South Lyme CT

Frost Advisory April 12, 06:03am until April 12, 09:00am
Click here for hazard details and duration
...
  •  
    Frost Advisory April 12, 06:03am until April 12, 09:00am

    NOW until 9:00am Sun

    Frost Advisory

  • Today

    High: 53 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers. Mostly cloudy, with a low around 42. South wind 3 to 8 mph.

    Low: 42 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 8 to 13 mph, with gusts as high as 25 mph.

    High: 63 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West wind 3 to 8 mph. Winds could gust as high as 21 mph.

    Low: 51 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 73 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

Detailed Forecast

Today
Increasing clouds, with a high near 53. Light and variable wind becoming south 5 to 10 mph in the morning.
Tonight
A 20 percent chance of showers. Mostly cloudy, with a low around 42. South wind 3 to 8 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 8 to 13 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West wind 3 to 8 mph. Winds could gust as high as 21 mph.
Tuesday
Mostly sunny, with a high near 73. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 76.
Wednesday Night
A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 76.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 67.
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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:
4:15 am EDT Apr 12, 2026
Forecast Valid:
6am EDT Apr 12, 2026-6pm EDT Apr 18, 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