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.

Overcast

57°F

14°C

Humidity 100%
Wind Speed Vrbl 1 mph
Barometer 29.94 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 14 Oct 5:35 am EDT
Extended Forecast for

Casco MI

  • Overnight

    Overnight: A slight chance of rain. Mostly cloudy, with a low around 56. Calm wind. Chance of precipitation is 20%.

    Low: 56 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 66. North wind 3 to 8 mph.

    High: 66 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 46. North northeast wind 3 to 5 mph.

    Low: 46 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, with a high near 64. East wind 5 to 8 mph.

    High: 64 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Rain. Low around 49. East southeast wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 49 °F

    Rain

  • Friday

    Friday: Rain. High near 60. Breezy. Chance of precipitation is 80%.

    High: 60 °F

    Rain and
    Breezy

  • Friday Night

    Friday Night: Rain before 8pm. Low around 35. Breezy. Chance of precipitation is 80%.

    Low: 35 °F

    Breezy. Rain
    then Mostly
    Clear

  • Saturday

    Saturday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

Detailed Forecast

Overnight
A slight chance of rain. Mostly cloudy, with a low around 56. Calm wind. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 66. North wind 3 to 8 mph.
Wednesday Night
Increasing clouds, with a low around 46. North northeast wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 64. East wind 5 to 8 mph.
Thursday Night
Rain. Low around 49. East southeast wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. High near 60. Breezy. Chance of precipitation is 80%.
Friday Night
Rain before 8pm. Low around 35. Breezy. Chance of precipitation is 80%.
Saturday
Sunny, with a high near 54.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 44.
Monday
Partly sunny, with a high near 65.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Casco MI
 42.77°N 82.66°W (Elev. 636 ft)
Last Update:
4:24 am EDT Oct 14, 2026
Forecast Valid:
5am EDT Oct 14, 2026-6pm EDT Oct 20, 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