National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St Clair County International Airport (KPHN)

Lat: 42.91°NLon: 82.53°WElev: 636ft.

Fair

82°F

28°C

Humidity 70%
Wind Speed S 10 G 18 mph
Barometer 29.98 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 21 Jun 1:55 pm EDT
Extended Forecast for

Casco MI

Extreme Heat Watch June 22, 08:00am until June 24, 08:00pm
Heat Advisory June 21, 02:00pm until June 22, 08:00am
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 88. South wind 11 to 15 mph, with gusts as high as 28 mph.

    High: 88 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 76. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 95. Heat index values as high as 103. Southwest wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 95 °F

    Hot

  • Sunday Night

    Sunday Night: Clear, with a low around 74. Southwest wind around 8 mph.

    Low: 74 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 94. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 94 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%.

    High: 90 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 88. South wind 11 to 15 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 76. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Sunday
Sunny and hot, with a high near 95. Heat index values as high as 103. Southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 74. Southwest wind around 8 mph.
Monday
Sunny and hot, with a high near 94. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 64.
Wednesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 86.
Thursday Night
Showers likely. Mostly cloudy, with a low around 67.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Casco MI
 42.74°N 82.67°W (Elev. 630 ft)
Last Update:
11:24 am EDT Jun 21, 2025
Forecast Valid:
1pm EDT Jun 21, 2025-6pm EDT Jun 27, 2025
 
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