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

St Clair County International Airport (KPHN)

Lat: 42.91°NLon: 82.53°WElev: 636ft.

Fair

66°F

19°C

Humidity 83%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 25 Jul 9:55 pm EDT
Extended Forecast for

Saint Clair MI

  • Tonight

    Tonight: Partly cloudy, with a low around 64. Light and variable wind.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms, mainly between 2pm and 4pm. Mostly sunny, with a high near 86. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 30%.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers after 2am. Increasing clouds, with a low around 66. Light and variable wind. Chance of precipitation is 40%.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers after 2pm. Partly sunny, with a high near 87. West southwest wind 3 to 8 mph. Chance of precipitation is 50%.

    High: 87 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 65. South southeast wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 64. Light and variable wind.
Sunday
A chance of showers and thunderstorms, mainly between 2pm and 4pm. Mostly sunny, with a high near 86. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 30%.
Sunday Night
A chance of showers after 2am. Increasing clouds, with a low around 66. Light and variable wind. Chance of precipitation is 40%.
Monday
A chance of showers after 2pm. Partly sunny, with a high near 87. West southwest wind 3 to 8 mph. Chance of precipitation is 50%.
Monday Night
A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 65. South southeast wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
A chance of showers before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 79. Chance of precipitation is 30%.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 85.
Friday Night
A chance of showers. Partly cloudy, with a low around 63.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Clair MI
 42.82°N 82.48°W (Elev. 577 ft)
Last Update:
9:49 pm EDT Jul 25, 2026
Forecast Valid:
10pm EDT Jul 25, 2026-6pm EDT Aug 1, 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