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.

Overcast

56°F

13°C

Humidity 55%
Wind Speed NW 16 G 26 mph
Barometer 29.72 in (1006.4 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 9 Nov 1:56 pm EST
Extended Forecast for

Old Lyme CT

  • This Afternoon

    This Afternoon: A 30 percent chance of rain before 4pm. Mostly sunny, with a steady temperature around 56. Northwest wind 11 to 13 mph, with gusts as high as 26 mph.

    High: 56 °F

    Chance Rain

  • Tonight

    Tonight: Mostly clear, with a low around 36. West wind 6 to 8 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 59. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.

    High: 59 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40. West wind around 6 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 59. Northwest wind 5 to 8 mph.

    High: 59 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 49. Chance of precipitation is 60%.

    High: 49 °F

    Rain Likely

Detailed Forecast

This Afternoon
A 30 percent chance of rain before 4pm. Mostly sunny, with a steady temperature around 56. Northwest wind 11 to 13 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 36. West wind 6 to 8 mph, with gusts as high as 22 mph.
Tuesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 59. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 40. West wind around 6 mph, with gusts as high as 20 mph.
Veterans Day
Sunny, with a high near 59. Northwest wind 5 to 8 mph.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.
Thursday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.
Friday
Rain likely. Mostly cloudy, with a high near 49. Chance of precipitation is 60%.
Friday Night
A chance of rain before 4am, then a chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Saturday
A 30 percent chance of snow. Mostly cloudy, with a high near 48.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
1:27 pm EST Nov 9, 2026
Forecast Valid:
2pm EST Nov 9, 2026-6pm EST Nov 15, 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