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

22°C

72°F

Humidity 94%
Wind Speed SW 17 km/h
Barometer 1004.5 mb (29.67 in)
Dewpoint 21°C (70°F)
Visibility 16 km
Last update 22 Jul 3:56 am EDT
Extended Forecast for

Groton CT

  • Overnight

    Overnight: A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 22. Southwest wind 21 to 23 km/h.

    Low: 22 °C

    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly cloudy, with a high near 25. Southwest wind 21 to 23 km/h.

    High: 25 °C

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 17. West wind around 13 km/h becoming north after midnight. Chance of precipitation is 30%.

    Low: 17 °C

    Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, then becoming sunny during the afternoon, with a high near 23. North wind 5 to 10 km/h becoming south in the afternoon.

    High: 23 °C

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 17. Calm wind.

    Low: 17 °C

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 23.

    High: 23 °C

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 17.

    Low: 17 °C

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 24.

    High: 24 °C

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 17.

    Low: 17 °C

    Partly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 22. Southwest wind 21 to 23 km/h.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly cloudy, with a high near 25. Southwest wind 21 to 23 km/h.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 17. West wind around 13 km/h becoming north after midnight. Chance of precipitation is 30%.
Thursday
Partly sunny, then becoming sunny during the afternoon, with a high near 23. North wind 5 to 10 km/h becoming south in the afternoon.
Thursday Night
Mostly clear, with a low around 17. Calm wind.
Friday
Sunny, with a high near 23.
Friday Night
Mostly clear, with a low around 17.
Saturday
Sunny, with a high near 24.
Saturday Night
Partly cloudy, with a low around 17.
Sunday
Mostly sunny, with a high near 24.
Sunday Night
Partly cloudy, with a low around 18.
Monday
A 30 percent chance of showers. Mostly sunny, with a high near 24.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 19.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 25.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Groton CT
 41.32°N 72.09°W (Elev. 3 m)
Last Update:
2:10 am EDT Jul 22, 2026
Forecast Valid:
4am EDT Jul 22, 2026-6pm EDT Jul 28, 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