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

69°F

21°C

Humidity 76%
Wind Speed N 8 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 15 Aug 8:56 am EDT
Extended Forecast for

Old Mystic CT

  • Today

    Today: Mostly sunny, with a high near 80. Light and variable wind becoming south around 5 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Low around 65. South wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers, mainly before 8am. High near 81. Southeast wind 7 to 11 mph becoming northeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 81 °F

    Showers then
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 80. Light and variable wind becoming south around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 58. Calm wind.
Sunday
Sunny, with a high near 79. Calm wind becoming south 5 to 9 mph in the afternoon.
Sunday Night
Showers, mainly after 2am. Low around 65. South wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Showers, mainly before 8am. High near 81. Southeast wind 7 to 11 mph becoming northeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 82.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 61.
Friday
Mostly sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Mystic CT
 41.37°N 71.99°W (Elev. 131 ft)
Last Update:
2:20 am EDT Aug 15, 2026
Forecast Valid:
9am EDT Aug 15, 2026-6pm EDT Aug 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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