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

32°F

0°C

Humidity 96%
Wind Speed NA
Barometer 30.14 in (1020.7 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Mar 7:56 am EDT
Extended Forecast for

3 Miles SE South Lyme CT

  • Today

    Today: A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 47. Light and variable wind becoming south 9 to 14 mph in the morning.

    High: 47 °F

    Sunny then
    Chance Rain

  • Tonight

    Tonight: Rain, mainly before 2am. Low around 41. Breezy, with a southwest wind 10 to 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Rain and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 51. Northwest wind around 10 mph.

    High: 51 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 37. North wind around 5 mph becoming light and variable in the evening.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of rain and snow before 11am, then a chance of rain. Mostly cloudy, with a high near 48. South wind 6 to 11 mph. Chance of precipitation is 30%.

    High: 48 °F

    Slight Chance
    Rain/Snow
    then Chance
    Rain

  • Sunday Night

    Sunday Night: Rain likely, mainly after 8pm. Mostly cloudy, with a low around 38. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Rain Likely

  • Monday

    Monday: A 40 percent chance of rain before 2pm. Mostly cloudy, with a high near 44.

    High: 44 °F

    Chance Rain

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 47. Light and variable wind becoming south 9 to 14 mph in the morning.
Tonight
Rain, mainly before 2am. Low around 41. Breezy, with a southwest wind 10 to 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Sunny, with a high near 51. Northwest wind around 10 mph.
Saturday Night
Mostly cloudy, with a low around 37. North wind around 5 mph becoming light and variable in the evening.
Sunday
A slight chance of rain and snow before 11am, then a chance of rain. Mostly cloudy, with a high near 48. South wind 6 to 11 mph. Chance of precipitation is 30%.
Sunday Night
Rain likely, mainly after 8pm. Mostly cloudy, with a low around 38. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A 40 percent chance of rain before 2pm. Mostly cloudy, with a high near 44.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 46.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE South Lyme CT
 41.3°N 72.24°W (Elev. 0 ft)
Last Update:
2:26 am EDT Mar 20, 2026
Forecast Valid:
8am EDT Mar 20, 2026-6pm EDT Mar 26, 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