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.

Fog/Mist

63°F

17°C

Humidity 100%
Wind Speed S 3 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 63°F (17°C)
Visibility 0.75 mi
Last update 29 Jun 2:56 am EDT
Extended Forecast for

Old Mystic CT

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

  • Overnight

    Overnight: Patchy dense fog. Otherwise, mostly cloudy, with a steady temperature around 63. Calm wind.

    Low: 63 °F

    Patchy Dense
    Fog

  • Monday

    Monday: Patchy dense fog before 9am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.

    High: 83 °F

    Patchy Dense
    Fog then
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. Light south wind.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 66. Southwest wind 6 to 8 mph.

    Low: 66 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, mostly cloudy, with a steady temperature around 63. Calm wind.
Monday
Patchy dense fog before 9am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 61. Light south wind.
Tuesday
Mostly sunny, with a high near 81. Light southwest wind becoming south 5 to 10 mph in the morning.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 66. Southwest wind 6 to 8 mph.
Wednesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
Sunny, with a high near 92.
Thursday Night
Mostly clear, with a low around 73.
Friday
Sunny, with a high near 93.
Friday Night
Partly cloudy, with a low around 71.
Independence Day
A 40 percent chance of showers. Mostly sunny, with a high near 89.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Mystic CT
 41.37°N 71.99°W (Elev. 131 ft)
Last Update:
2:28 am EDT Jun 29, 2026
Forecast Valid:
3am EDT Jun 29, 2026-6pm EDT Jul 5, 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