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

81°F

27°C

Humidity 51%
Wind Speed N 3 mph
Barometer 29.99 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 13 Aug 2:56 pm EDT
Extended Forecast for

Saint Clair MI

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 84. Light north northeast wind.

    High: 84 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 83. Calm wind becoming north northeast 5 to 7 mph in the afternoon.

    High: 83 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Mostly sunny, with a high near 82. Southeast wind 5 to 8 mph. Chance of precipitation is 30%.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 65. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 2pm. High near 84. Chance of precipitation is 80%.

    High: 84 °F

    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of thunderstorms before 8pm. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 84. Light north northeast wind.
Tonight
Mostly cloudy, with a low around 63. Calm wind.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 83. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.
Saturday
A chance of showers after 2pm. Mostly sunny, with a high near 82. Southeast wind 5 to 8 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 65. Chance of precipitation is 80%.
Sunday
Showers, with thunderstorms also possible after 2pm. High near 84. Chance of precipitation is 80%.
Sunday Night
A chance of thunderstorms before 8pm. Mostly cloudy, with a low around 63.
Monday
Mostly sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
A chance of showers. Partly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Clair MI
 42.82°N 82.48°W (Elev. 577 ft)
Last Update:
2:24 pm EDT Aug 13, 2026
Forecast Valid:
3pm EDT Aug 13, 2026-6pm EDT Aug 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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