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

48°F

9°C

Humidity 46%
Wind Speed Calm
Barometer 29.79 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 26 Mar 3:15 am EDT
Extended Forecast for

Saint Clair MI

  • Overnight

    Overnight: Mostly cloudy, with a low around 46. Southwest wind around 7 mph.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 60. Southwest wind 5 to 8 mph becoming north northeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 60 °F

    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers, mainly before 10pm. Low around 27. North wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 27 °F

    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 33. North wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 33 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 20. North wind 5 to 9 mph becoming calm after midnight.

    Low: 20 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 52.

    High: 52 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 46. Southwest wind around 7 mph.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 60. Southwest wind 5 to 8 mph becoming north northeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers, mainly before 10pm. Low around 27. North wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Mostly sunny, with a high near 33. North wind 11 to 13 mph, with gusts as high as 22 mph.
Friday Night
Mostly clear, with a low around 20. North wind 5 to 9 mph becoming calm after midnight.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 52.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Partly sunny, with a high near 61.
Monday Night
A chance of rain. Mostly cloudy, with a low around 39.
Tuesday
A chance of rain. Mostly cloudy, with a high near 52.
Tuesday Night
Rain likely. Mostly cloudy, with a low around 42.
Wednesday
Rain likely. Mostly cloudy, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Clair MI
 42.82°N 82.51°W (Elev. 600 ft)
Last Update:
3:13 am EDT Mar 26, 2026
Forecast Valid:
3am EDT Mar 26, 2026-6pm EDT Apr 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