Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

68°F

20°C

Humidity 21%
Wind Speed NW 15 G 32 mph
Barometer 29.78 in (1008.3 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 23 Apr 4:56 pm EDT
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Northwest wind 5 to 9 mph becoming calm  in the evening. Winds could gust as high as 20 mph.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of rain before 11am.  Mostly cloudy through mid morning, then gradual clearing, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.

    High: 61 °F

    Slight Chance
    Rain then
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39. Calm wind.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of rain, mainly after 2pm.  Partly sunny, with a high near 51. Southeast wind 5 to 9 mph.

    High: 51 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain.  Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm  in the evening.

    Low: 41 °F

    Chance Rain

  • Sunday

    Sunday: A 40 percent chance of rain.  Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm.  Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. Northwest wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 20 mph.
Friday
A 20 percent chance of rain before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 39. Calm wind.
Saturday
A 30 percent chance of rain, mainly after 2pm. Partly sunny, with a high near 51. Southeast wind 5 to 9 mph.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm in the evening.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 58.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 46.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 59.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of showers. Mostly cloudy, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
2:07 pm EDT Apr 23, 2026
5pm EDT Apr 23, 2026-6pm EDT Apr 30, 2026
 
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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