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

55°F

13°C

Humidity 94%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 20 Aug 1:15 am EDT
Extended Forecast for

3 Miles NE Casco MI

  • Overnight

    Overnight: Partly cloudy, with a low around 55. Calm wind.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 80 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. Northeast wind around 6 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82. Calm wind becoming south southeast 5 to 7 mph in the afternoon.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. South southeast wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 81. Chance of precipitation is 80%.

    High: 81 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 8pm. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 55. Calm wind.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 56. Northeast wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 82. Calm wind becoming south southeast 5 to 7 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 61. South southeast wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 81. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm before 8pm. Low around 56. Chance of precipitation is 80%.
Sunday
Sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 53.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 60.
Wednesday
A chance of showers. Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NE Casco MI
 42.81°N 82.63°W (Elev. 630 ft)
Last Update:
10:13 pm EDT Aug 19, 2026
Forecast Valid:
1am EDT Aug 20, 2026-6pm EDT Aug 26, 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