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.

Partly Cloudy

77°F

25°C

Humidity 39%
Wind Speed NE 6 mph
Barometer 30.18 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 28 Aug 2:15 pm EDT
Extended Forecast for

Casco MI

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 77. North northeast wind 3 to 5 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Mostly Clear

  • Saturday

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

    High: 82 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 66. South wind 3 to 7 mph.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 85. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 85 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of showers. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 87.

    High: 87 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers before 2pm. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 77. North northeast wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 59. Light and variable wind.
Saturday
Increasing clouds, with a high near 82. Light southwest wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Saturday Night
Mostly cloudy, with a low around 66. South wind 3 to 7 mph.
Sunday
Mostly cloudy, with a high near 85. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Monday
Mostly cloudy, with a high near 87.
Monday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 71.
Tuesday
A chance of showers before 2pm. Partly sunny, with a high near 90.
Tuesday Night
A chance of thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 69.
Wednesday
A chance of showers. Partly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Casco MI
 42.74°N 82.67°W (Elev. 630 ft)
Last Update:
4:24 am EDT Aug 28, 2026
Forecast Valid:
2pm EDT Aug 28, 2026-6pm EDT Sep 3, 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