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

78°F

26°C

Humidity 82%
Wind Speed SW 12 mph
Barometer 29.87 in (1011.4 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Aug 12:56 pm EDT
Extended Forecast for

3 Miles SE Old Lyme CT

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. Southwest wind around 8 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after 5pm. Increasing clouds, with a high near 80. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 80 °F

    Mostly Sunny
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 63. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 79. North wind around 6 mph becoming southeast in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 50 percent chance of showers after 8am. Partly sunny, with a high near 77.

    High: 77 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers. Partly sunny, with a high near 80.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 82. Southwest wind around 8 mph.
Tonight
Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Showers likely, mainly after 5pm. Increasing clouds, with a high near 80. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
Showers likely, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 63. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Mostly sunny, with a high near 79. North wind around 6 mph becoming southeast in the afternoon.
Friday Night
Mostly cloudy, with a low around 63.
Saturday
A 50 percent chance of showers after 8am. Partly sunny, with a high near 77.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 64.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 64.
Monday
Mostly sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 62.
Tuesday
Sunny, with a high near 79.
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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:
5:30 am EDT Aug 19, 2026
Forecast Valid:
1pm EDT Aug 19, 2026-6pm EDT Aug 25, 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