National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

25°F

-4°C

Humidity 75%
Wind Speed Calm
Barometer 30.54 in (1034.2 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 29 Mar 3:56 am EDT
Extended Forecast for

3 Miles SE Old Lyme CT

  • Today

    Today: Mostly sunny, with a high near 47. Light west wind becoming southwest 8 to 13 mph in the morning.

    High: 47 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 40. Southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Increasing
    Clouds

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 55. Southwest wind 10 to 15 mph.

    High: 55 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 46. Southwest wind 6 to 10 mph. Chance of precipitation is 20%.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers, mainly between 8am and 2pm. Partly sunny, with a high near 61. Southwest wind 7 to 14 mph.

    High: 61 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.

    Low: 42 °F

    Rain Likely

  • Thursday

    Thursday: A 50 percent chance of rain. Mostly cloudy, with a high near 48.

    High: 48 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 47. Light west wind becoming southwest 8 to 13 mph in the morning.
Tonight
Increasing clouds, with a low around 40. Southwest wind around 10 mph, with gusts as high as 20 mph.
Monday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 55. Southwest wind 10 to 15 mph.
Monday Night
A slight chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 46. Southwest wind 6 to 10 mph. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of showers, mainly between 8am and 2pm. Partly sunny, with a high near 61. Southwest wind 7 to 14 mph.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 64.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 48.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
Rain likely. Cloudy, with a high near 48. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of rain. Cloudy, with a low around 39.
Saturday
A 40 percent chance of rain. Cloudy, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Old Lyme CT
 41.28°N 72.3°W (Elev. 0 ft)
Last Update:
2:25 am EDT Mar 29, 2026
Forecast Valid:
4am EDT Mar 29, 2026-6pm EDT Apr 4, 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