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

59°F

15°C

Humidity 45%
Wind Speed N 10 G 20 mph
Barometer 30.34 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 21 May 3:15 pm EDT
Extended Forecast for

Fort Gratiot MI

  • This Afternoon

    This Afternoon: Mostly sunny, with a steady temperature around 54. North northeast wind around 15 mph, with gusts as high as 22 mph.

    High: 54 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 42. East northeast wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 42 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 64. East northeast wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 64 °F

    Partly Sunny

  • Friday Night

    Friday Night: Showers likely after 2am. Cloudy, with a low around 48. East wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 48 °F

    Cloudy then
    Showers
    Likely

  • Saturday

    Saturday: Showers. High near 62. Breezy, with an east southeast wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 62 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: A chance of showers before 2am. Cloudy, with a low around 48. Chance of precipitation is 40%.

    Low: 48 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a steady temperature around 54. North northeast wind around 15 mph, with gusts as high as 22 mph.
Tonight
Partly cloudy, with a low around 42. East northeast wind 7 to 11 mph, with gusts as high as 21 mph.
Friday
Partly sunny, with a high near 64. East northeast wind 11 to 14 mph, with gusts as high as 22 mph.
Friday Night
Showers likely after 2am. Cloudy, with a low around 48. East wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Showers. High near 62. Breezy, with an east southeast wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
A chance of showers before 2am. Cloudy, with a low around 48. Chance of precipitation is 40%.
Sunday
Mostly cloudy, with a high near 71.
Sunday Night
Mostly cloudy, with a low around 51.
Memorial Day
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fort Gratiot MI
 43.08°N 82.5°W (Elev. 623 ft)
Last Update:
2:24 pm EDT May 21, 2026
Forecast Valid:
3pm EDT May 21, 2026-6pm EDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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