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

28°C

82°F

Humidity 58%
Wind Speed W 19 km/h
Barometer 1008.2 mb (29.78 in)
Dewpoint 19°C (66°F)
Visibility 16 km
Heat Index29°C (84°F)
Last update 3 Jul 3:56 pm EDT
Extended Forecast for

Old Lyme CT

Severe T-storm Watch until July 3, 10:00pm
Click here for hazard details and duration
Severe T-storm Watch
  •  
    Severe T-storm Watch until July 3, 10:00pm

    NOW until 10:00pm Thu

    Severe T-storm Watch

  • This Afternoon

    High: 30 °C

    Severe
    Thunderstorms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Some of the storms could be severe. Partly cloudy, with a low around 17. Northwest wind 3 to 8 km/h.

    Low: 17 °C

    Severe
    Thunderstorms
    then Mostly
    Clear

  • Independence Day

    Independence Day: Sunny, with a high near 28. Northwest wind 10 to 13 km/h.

    High: 28 °C

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 17. Northwest wind 5 to 8 km/h becoming calm in the evening.

    Low: 17 °C

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 28. Light and variable wind becoming south 6 to 11 km/h in the afternoon.

    High: 28 °C

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 19.

    Low: 19 °C

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 29.

    High: 29 °C

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 21.

    Low: 21 °C

    Mostly Clear

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Some of the storms could be severe. Mostly sunny, with a high near 30. West wind around 13 km/h.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Some of the storms could be severe. Partly cloudy, with a low around 17. Northwest wind 3 to 8 km/h.
Independence Day
Sunny, with a high near 28. Northwest wind 10 to 13 km/h.
Friday Night
Mostly clear, with a low around 17. Northwest wind 5 to 8 km/h becoming calm in the evening.
Saturday
Mostly sunny, with a high near 28. Light and variable wind becoming south 6 to 11 km/h in the afternoon.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
Mostly sunny, with a high near 29.
Sunday Night
Mostly clear, with a low around 21.
Monday
Partly sunny, with a high near 30.
Monday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 21.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 28.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 20.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 28.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 19.
Thursday
A chance of showers. Partly sunny, with a high near 27.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 m)
Last Update:
2:32 pm EDT Jul 3, 2025
Forecast Valid:
4pm EDT Jul 3, 2025-6pm EDT Jul 10, 2025
 
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