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.

Fair

66°F

19°C

Humidity 70%
Wind Speed NA
Barometer 29.97 in (1014.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 14 Apr 11:56 am EDT
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Sunny, with a temperature falling to around 69 by 5pm. South wind 5 to 7 mph.

    High: 74 °F⇓

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 53. South wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 75. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 75 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 71. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 71 °F

    Partly Sunny

  • Thursday Night

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

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers after 8am. Partly sunny, with a high near 72.

    High: 72 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a temperature falling to around 69 by 5pm. South wind 5 to 7 mph.
Tonight
Partly cloudy, with a low around 53. South wind around 5 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 75. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 71. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
A 40 percent chance of showers after 8am. Partly sunny, with a high near 72.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Mostly cloudy, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 62.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 54.
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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:
10:17 am EDT Apr 14, 2026
Forecast Valid:
12pm EDT Apr 14, 2026-6pm EDT Apr 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