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

57°F

14°C

Humidity 83%
Wind Speed Calm
Barometer 30.18 in (1022.1 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 19 Sep 8:56 pm EDT
Extended Forecast for

Old Mystic CT

  • Tonight

    Tonight: Increasing clouds, with a low around 51. Calm wind.

    Low: 51 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers, mainly between 2pm and 5pm, then rain after 5pm. High near 68. Southeast wind 5 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 68 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Rain before 8pm, then showers, mainly between 8pm and 2am. Low around 54. Light and variable wind becoming north around 6 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 54 °F

    Rain

  • Monday

    Monday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 68. Northeast wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 68 °F

    Chance
    Showers then
    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 50. Northeast wind 5 to 7 mph.

    Low: 50 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 51. Calm wind.
Sunday
Showers, mainly between 2pm and 5pm, then rain after 5pm. High near 68. Southeast wind 5 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain before 8pm, then showers, mainly between 8pm and 2am. Low around 54. Light and variable wind becoming north around 6 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 68. Northeast wind 9 to 11 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 50. Northeast wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 49.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 49.
Thursday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 65.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 49.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 50.
Saturday
A 30 percent chance of showers. Mostly cloudy, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Mystic CT
 41.37°N 71.96°W (Elev. 43 ft)
Last Update:
2:28 pm EDT Sep 19, 2026
Forecast Valid:
9pm EDT Sep 19, 2026-6pm EDT Sep 26, 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