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.

Mostly Cloudy

77°F

25°C

Humidity 57%
Wind Speed NW 9 mph
Barometer 29.93 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 13 Sep 1:15 pm EDT
Extended Forecast for

Saint Clair MI

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 79. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Partly Sunny

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 49. Northwest wind 6 to 11 mph, with gusts as high as 23 mph.

    Low: 49 °F

    Gradual
    Clearing

  • Monday

    Monday: Sunny, with a high near 70. North northeast wind around 6 mph.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 55. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 55 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A chance of showers. Partly sunny, with a high near 80. South wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers likely after 11pm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Showers likely after 2am. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy
    then Showers
    Likely

  • Thursday

    Thursday: Showers likely, mainly before 8am. Partly sunny, with a high near 78.

    High: 78 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Partly sunny, with a high near 79. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 49. Northwest wind 6 to 11 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 70. North northeast wind around 6 mph.
Monday Night
Increasing clouds, with a low around 55. Calm wind becoming south southeast around 6 mph after midnight.
Tuesday
A chance of showers. Partly sunny, with a high near 80. South wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.
Tuesday Night
Showers likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers likely after 11pm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Wednesday
Partly sunny, with a high near 75.
Wednesday Night
Showers likely after 2am. Mostly cloudy, with a low around 61.
Thursday
Showers likely, mainly before 8am. Partly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 75.
Friday Night
A chance of showers. Mostly cloudy, with a low around 57.
Saturday
A chance of showers. Partly sunny, with a high near 75.
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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:
1:13 pm EDT Sep 13, 2026
Forecast Valid:
1pm EDT Sep 13, 2026-6pm EDT Sep 19, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation