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.

Light Rain

54°F

12°C

Humidity 97%
Wind Speed Calm
Barometer 29.73 in (1006.6 mb)
Dewpoint 53°F (12°C)
Visibility 7.00 mi
Last update 14 May 12:56 pm EDT
Extended Forecast for

South Lyme CT

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm. High near 62. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 2am. Mostly cloudy, with a low around 51. Light northwest wind.

    Low: 51 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers, mainly after 11am. Mostly cloudy, with a high near 62. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 62 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 51. Calm wind.

    Low: 51 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 74. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 74 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 62. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 30 percent chance of showers, mainly before 2am. Mostly cloudy, with a low around 51. Light northwest wind.
Friday
A 40 percent chance of showers, mainly after 11am. Mostly cloudy, with a high near 62. Calm wind becoming northwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 51. Calm wind.
Saturday
Sunny, with a high near 74. Calm wind becoming southwest 5 to 9 mph in the morning.
Saturday Night
Partly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 80.
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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:
6:45 am EDT May 14, 2026
Forecast Valid:
1pm EDT May 14, 2026-6pm EDT May 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