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

44°F

7°C

Humidity 93%
Wind Speed SW 9 mph
Barometer 29.78 in (1008.2 mb)
Dewpoint 42°F (6°C)
Visibility 9.00 mi
Wind Chill39°F (4°C)
Last update 21 Mar 12:56 am EDT
Extended Forecast for

3 Miles SE South Lyme CT

  • Overnight

    Overnight: Showers, mainly before 2am. Patchy fog after 2am. Low around 40. Southwest wind around 14 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Showers and
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 53. Northwest wind 9 to 13 mph.

    High: 53 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 38. Northeast wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 30 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 51. South wind 7 to 13 mph.

    High: 51 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Rain likely, mainly after 8pm. Cloudy, with a low around 37. Southwest wind around 8 mph becoming northeast after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 37 °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 31.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers, mainly before 2am. Patchy fog after 2am. Low around 40. Southwest wind around 14 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 53. Northwest wind 9 to 13 mph.
Saturday Night
Increasing clouds, with a low around 38. Northeast wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 51. South wind 7 to 13 mph.
Sunday Night
Rain likely, mainly after 8pm. Cloudy, with a low around 37. Southwest wind around 8 mph becoming northeast after midnight. Chance of precipitation is 70%. 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 31.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
A chance of rain between 8am and 2pm. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 47.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 37.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 48.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE South Lyme CT
 41.3°N 72.24°W (Elev. 0 ft)
Last Update:
8:14 pm EDT Mar 20, 2026
Forecast Valid:
1am EDT Mar 21, 2026-6pm EDT Mar 27, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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