Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Partly Cloudy

49°F

9°C

Humidity 93%
Wind Speed NE 8 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 18 Apr 5:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Partly sunny, with a high near 61. Calm wind becoming east 5 to 7 mph in the morning.

    High: 61 °F

    Partly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers after 5am.  Patchy fog after 11pm.  Otherwise, mostly cloudy, with a low around 45. Light southeast wind.

    Low: 45 °F

    Patchy Fog
    then Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then showers after 2pm.  High near 58. Light and variable wind becoming northwest 8 to 13 mph in the afternoon.  Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 58 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 37. Northwest wind 3 to 6 mph.

    Low: 37 °F

    Gradual
    Clearing

  • Monday

    Monday: A 20 percent chance of showers after 2pm.  Mostly sunny, with a high near 52. Northwest wind 5 to 7 mph.

    High: 52 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • 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

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 61. Calm wind becoming east 5 to 7 mph in the morning.
Tonight
A 30 percent chance of showers after 5am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 45. Light southeast wind.
Sunday
Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then showers after 2pm. High near 58. Light and variable wind becoming northwest 8 to 13 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 37. Northwest wind 3 to 6 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 52. Northwest wind 5 to 7 mph.
Monday Night
Partly cloudy, with a low around 32.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 41.
Thursday
Sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, 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)
5:23 am EDT Apr 18, 2026
6am EDT Apr 18, 2026-6pm EDT Apr 24, 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