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.

Mostly Cloudy

63°F

17°C

Humidity 81%
Wind Speed NA
Barometer 30.12 in (1020.0 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 20 Aug 7:56 am EDT
Extended Forecast for

Old Mystic CT

  • Today

    Today: Showers likely, then showers and possibly a thunderstorm after 5pm. High near 73. East wind 6 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 73 °F

    Chance
    Showers then
    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 59. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.

    Low: 59 °F

    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before 8am. Mostly cloudy, with a high near 71. Northeast wind 13 to 15 mph, with gusts as high as 28 mph.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 58. Northeast wind around 16 mph, with gusts as high as 28 mph.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 79. North wind 11 to 17 mph, with gusts as high as 31 mph.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
Showers likely, then showers and possibly a thunderstorm after 5pm. High near 73. East wind 6 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 59. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Thursday
A 30 percent chance of showers, mainly before 8am. Mostly cloudy, with a high near 71. Northeast wind 13 to 15 mph, with gusts as high as 28 mph.
Thursday Night
Mostly cloudy, with a low around 58. Northeast wind around 16 mph, with gusts as high as 28 mph.
Friday
Mostly sunny, with a high near 79. North wind 11 to 17 mph, with gusts as high as 31 mph.
Friday Night
Mostly clear, with a low around 59.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
A 50 percent chance of showers after 8pm. Mostly cloudy, with a low around 64.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 77.
Monday Night
A 30 percent chance of showers. Partly cloudy, with a low around 60.
Tuesday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Mystic CT
 41.37°N 71.96°W (Elev. 43 ft)
Last Update:
2:48 am EDT Aug 20, 2025
Forecast Valid:
8am EDT Aug 20, 2025-6pm EDT Aug 26, 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