National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

61°F

16°C

Humidity 78%
Wind Speed Calm
Barometer 29.85 in (1010.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 16 Jun 11:56 pm EDT
Extended Forecast for

Conning Towers-Nautilus Park CT

  • Overnight

    Overnight: Partly cloudy, with a low around 57. Southwest wind around 5 mph becoming calm.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. Calm wind becoming south 5 to 9 mph in the morning.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 59. Light south wind.

    Low: 59 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southeast wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 65. West wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Showers
    Likely then
    Mostly Clear

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Friday Night

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

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 57. Southwest wind around 5 mph becoming calm.
Wednesday
Mostly sunny, with a high near 76. Calm wind becoming south 5 to 9 mph in the morning.
Wednesday Night
Increasing clouds, with a low around 59. Light south wind.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southeast wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 65. West wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Juneteenth
Mostly sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 60.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 77.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 61.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Conning Towers-Nautilus Park CT
 41.39°N 72.07°W (Elev. 200 ft)
Last Update:
3:07 pm EDT Jun 16, 2026
Forecast Valid:
12am EDT Jun 17, 2026-6pm EDT Jun 23, 2026
 
Forecast Discussion
 
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Additional Resources

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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