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.

A Few Clouds

72°F

22°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 8 Aug 4:56 am EDT
Extended Forecast for

Preston CT

Heat Advisory August 8, 11:00am until August 8, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 96. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 89 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers before 11pm. Partly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    Showers then
    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 90. Heat index values as high as 95. Light west wind increasing to 5 to 9 mph in the morning.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Light northwest wind.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 87. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 87 °F

    Sunny

  • Monday Night

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

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 84.

    High: 84 °F

    Chance
    Showers

Detailed Forecast

Today
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 96. Light southwest wind increasing to 5 to 10 mph in the morning.
Tonight
A 30 percent chance of showers before 11pm. Partly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 90. Heat index values as high as 95. Light west wind increasing to 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 64. Light northwest wind.
Monday
Sunny, with a high near 87. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 70.
Tuesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.
Tuesday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 65.
Wednesday
A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 84.
Wednesday Night
A 30 percent chance of showers after 8pm. Mostly cloudy, with a low around 64.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 62.
Friday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Preston CT
 41.53°N 71.98°W (Elev. 200 ft)
Last Update:
2:28 am EDT Aug 8, 2026
Forecast Valid:
5am EDT Aug 8, 2026-6pm EDT Aug 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation