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.

A Few Clouds

75°F

24°C

Humidity 90%
Wind Speed S 7 mph
Barometer 30.01 in (1016.0 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 2 Aug 9:56 am EDT
Extended Forecast for

Old Mystic CT

  • Today

    Today: Mostly cloudy, with a high near 80. South wind 7 to 9 mph.

    High: 80 °F

    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Low around 70. Southeast wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 70 °F

    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 78. South wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 78 °F

    Showers

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 66. Southwest wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Northwest wind around 6 mph becoming southwest in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 80. South wind 7 to 9 mph.
Tonight
A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Low around 70. Southeast wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. High near 78. South wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 66. Southwest wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly sunny, with a high near 82. Northwest wind around 6 mph becoming southwest in the afternoon.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 72.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Mystic CT
 41.37°N 71.99°W (Elev. 131 ft)
Last Update:
7:44 am EDT Aug 2, 2026
Forecast Valid:
10am EDT Aug 2, 2026-6pm EDT Aug 8, 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