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.

Overcast

68°F

20°C

Humidity 90%
Wind Speed Calm
Barometer 30.26 in (1024.7 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 17 Sep 2:56 am EDT
Extended Forecast for

Hadlyme CT

  • Overnight

    Overnight: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 79 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A 50 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 65. Light south wind.

    Low: 65 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 78. North wind 5 to 8 mph.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 51. North wind 3 to 5 mph.

    Low: 51 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers. High near 67. Chance of precipitation is 90%.

    High: 67 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 2am. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

Detailed Forecast

Overnight
Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 63. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
A 50 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 65. Light south wind.
Friday
Mostly sunny, with a high near 78. North wind 5 to 8 mph.
Friday Night
Partly cloudy, with a low around 51. North wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
Mostly cloudy, with a low around 53.
Sunday
Showers. High near 67. Chance of precipitation is 90%.
Sunday Night
Showers, mainly before 2am. Low around 53. Chance of precipitation is 80%.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 67.
Monday Night
Mostly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hadlyme CT
 41.42°N 72.33°W (Elev. 207 ft)
Last Update:
1:55 am EDT Sep 17, 2026
Forecast Valid:
3am EDT Sep 17, 2026-6pm EDT Sep 23, 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