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

75°F

24°C

Humidity 84%
Wind Speed S 10 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 1 Jul 9:56 am EDT
Extended Forecast for

Old Lyme CT

Extreme Heat Watch July 3, 09:00pm until July 4, 09:00pm
Extreme Heat Warning July 1, 12:00pm until July 3, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning

  • Today

    Today: Sunny, with a high near 86. Southwest wind around 11 mph, with gusts as high as 21 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southwest wind 5 to 8 mph, with gusts as high as 20 mph.

    Low: 69 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 6 to 9 mph.

    High: 94 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 73. Southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 73 °F

    Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 98. Light west wind increasing to 5 to 10 mph in the morning.

    High: 98 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Independence Day

    Independence Day: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers after 2pm. Partly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 86. Southwest wind around 11 mph, with gusts as high as 21 mph.
Tonight
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southwest wind 5 to 8 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 6 to 9 mph.
Thursday Night
Clear, with a low around 73. Southwest wind 5 to 7 mph becoming calm in the evening.
Friday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 98. Light west wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 72.
Independence Day
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 94.
Saturday Night
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 70.
Sunday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 87.
Sunday Night
Showers likely, mainly after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Monday
Showers likely. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Monday Night
Showers likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Tuesday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
2:37 am EDT Jul 1, 2026
Forecast Valid:
10am EDT Jul 1, 2026-6pm EDT Jul 7, 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