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.

Partly Cloudy

67°F

19°C

Humidity 73%
Wind Speed SW 12 mph
Barometer 29.81 in (1009.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 Apr 2:56 pm EDT
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Mostly cloudy, with a high near 73. West wind around 5 mph. Chance of precipitation is 50%.

    High: 73 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers before 8pm. Partly cloudy, with a low around 49. Calm wind. Chance of precipitation is 30%.

    Low: 49 °F

    Scattered
    Showers then
    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 61. East wind 3 to 8 mph.

    High: 61 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 45. Southeast wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 56. Light and variable wind becoming northwest 9 to 14 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 36.

    Low: 36 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Mostly cloudy, with a high near 73. West wind around 5 mph. Chance of precipitation is 50%.
Tonight
Scattered showers before 8pm. Partly cloudy, with a low around 49. Calm wind. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 61. East wind 3 to 8 mph.
Saturday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 45. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Showers, mainly after 8am. High near 56. Light and variable wind becoming northwest 9 to 14 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 36.
Monday
Mostly sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 32.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 61.
Wednesday Night
Partly cloudy, with a low around 42.
Thursday
Sunny, with a high near 61.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 61.
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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:
2:24 pm EDT Apr 17, 2026
Forecast Valid:
3pm EDT Apr 17, 2026-6pm EDT Apr 24, 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