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.

Fog/Mist

49°F

9°C

Humidity 97%
Wind Speed SW 6 mph
Barometer 30.12 in (1019.9 mb)
Dewpoint 48°F (9°C)
Visibility 1.75 mi
Wind Chill46°F (8°C)
Last update 3 Apr 9:56 pm EDT
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Widespread dense fog, mainly after 5am. Otherwise, mostly cloudy, with a low around 48. Southwest wind around 7 mph.

    Low: 48 °F

    Dense Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Widespread dense fog, mainly before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 59. Light and variable wind becoming east 5 to 10 mph in the afternoon.

    High: 59 °F

    Dense Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 40. East wind 8 to 11 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers after 2pm. High near 57. Southwest wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 57 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 39. Northwest wind around 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Showers then
    Slight Chance
    Showers

  • Monday

    Monday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow showers before 2pm. Mostly sunny, with a high near 48. Chance of precipitation is 30%.

    High: 48 °F

    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Tonight
Widespread dense fog, mainly after 5am. Otherwise, mostly cloudy, with a low around 48. Southwest wind around 7 mph.
Saturday
A 20 percent chance of showers after 2pm. Widespread dense fog, mainly before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 59. Light and variable wind becoming east 5 to 10 mph in the afternoon.
Saturday Night
A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 40. East wind 8 to 11 mph, with gusts as high as 23 mph.
Sunday
Showers likely and possibly a thunderstorm, then showers after 2pm. High near 57. Southwest wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers, mainly before 8pm. Low around 39. Northwest wind around 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
A chance of rain and snow showers before 2pm. Mostly sunny, with a high near 48. Chance of precipitation is 30%.
Tuesday Night
Mostly clear, with a low around 29.
Wednesday
Sunny, with a high near 45.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, with a high near 53.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 58.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.29°N 72.33°W (Elev. 16 ft)
Last Update:
2:23 pm EDT Apr 3, 2026
Forecast Valid:
10pm EDT Apr 3, 2026-6pm EDT Apr 10, 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