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

73°F

23°C

Humidity 50%
Wind Speed NE 8 mph
Barometer 30.01 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 11 Sep 5:36 pm EDT
Extended Forecast for

Casco MI

  • Tonight

    Tonight: Clear, with a low around 58. Light southeast wind.

    Low: 58 °F

    Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 82. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 82 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 64. South wind around 5 mph becoming light and variable in the evening.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 78. West northwest wind 3 to 8 mph.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52. North northwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of showers before 2pm. Mostly cloudy, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Showers
    Likely

Detailed Forecast

Tonight
Clear, with a low around 58. Light southeast wind.
Saturday
Increasing clouds, with a high near 82. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Saturday Night
Partly cloudy, with a low around 64. South wind around 5 mph becoming light and variable in the evening.
Sunday
Mostly sunny, with a high near 78. West northwest wind 3 to 8 mph.
Sunday Night
Partly cloudy, with a low around 52. North northwest wind 6 to 9 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 71.
Monday Night
Mostly cloudy, with a low around 57.
Tuesday
A chance of showers before 2pm. Mostly cloudy, with a high near 78.
Tuesday Night
Showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 63.
Wednesday
A chance of showers. Mostly cloudy, with a high near 74.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 60.
Thursday
A chance of showers. Partly sunny, with a high near 73.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 56.
Friday
A chance of showers. Mostly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Casco MI
 42.77°N 82.66°W (Elev. 636 ft)
Last Update:
4:24 pm EDT Sep 11, 2026
Forecast Valid:
5pm EDT Sep 11, 2026-6pm EDT Sep 18, 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