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

64°F

18°C

Humidity 87%
Wind Speed Calm
Barometer 30.04 in (1017.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 25 May 8:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 81 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58. Light southwest wind.

    Low: 58 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 86. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 86 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 61. Light and variable wind.

    Low: 61 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. Calm wind.
Tuesday
Partly sunny, with a high near 81. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 58. Light southwest wind.
Wednesday
Partly sunny, with a high near 86. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 61. Light and variable wind.
Thursday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 80.
Thursday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 71.
Friday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 53.
Saturday
A 30 percent chance of showers before 2pm. Partly sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 52.
Monday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.35°N 72.29°W (Elev. 98 ft)
Last Update:
3:13 pm EDT May 25, 2026
Forecast Valid:
9pm EDT May 25, 2026-6pm EDT Jun 1, 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