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St. Clair, MI Weather Forecast

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St. Clair, MI Weather Forecast

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St. Clair MI weather - Clear - 75°F
Clear
75°F
Updated 5:16 pm
Feels Like 76°F
Humidity 53%
Wind NNE 8 mph
Barometer  30.11 in
Dew Point 57°F
St. Clair MI weather - Clear - 24°C
Clear
24°C
Updated 5:16 pm
Feels Like 24°C
Humidity 53%
Wind NNE 13 km/h
Barometer  102 kPa
Dew Point 14°C
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St. Clair Weather Forecast

TONIGHT LABOR DAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY
St. Clair, MI Weather - Tonight Patchy Fog St. Clair, MI Weather - Labor Day Mostly Sunny St. Clair, MI Weather - Monday Night Partly Cloudy St. Clair, MI Weather - Tuesday Partly Cloudy St. Clair, MI Weather - Tuesday Night Chance Of Showers St. Clair, MI Weather - Wednesday Chance Of Showers St. Clair, MI Weather - Wednesday Night Mostly Cloudy St. Clair, MI Weather - Thursday Partly Cloudy St. Clair, MI Weather - Thursday Night Clearing St. Clair, MI Weather - Friday Mostly Sunny St. Clair, MI Weather - Friday Night Mostly Clear St. Clair, MI Weather - Saturday Mostly Sunny
Patchy Fog Mostly Sunny Partly Cloudy Partly Cloudy Chance of Showers Chance of Showers Mostly Cloudy Partly Cloudy Clearing Mostly Sunny Mostly Clear Mostly Sunny
Lo: 55°FLo: 13°C Hi: 79°FHi: 26°C
 Lo: 55°FLo: 13°C Hi: 80°FHi: 27°C
 Lo: 69°FLo: 21°C Hi: 81°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 75°FHi: 24°C
 Lo: 51°FLo: 11°C Hi: 75°FHi: 24°C
 Lo: 59°FLo: 15°C Hi: 80°FHi: 27°C
POP: 40% POP: 70%
POP = Probability of Precipitation.
Weather Outlook Updated: 343 PM EDT Sun Sep 06 2026 St. Clair, MI Weather - WeatherWorld.com

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St. Clair Forecast Discussion

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Issued: 341 PM EDT Sun Sep 6 2026

Key Messages

  • Seasonable temperatures with lower humidity with exist through the early week.
  • Next chance of showers and thunderstorms arrives Tuesday night into Wednesday.

Discussion

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Cool northeast flow over Lake Huron paired with early September sun has produced steep low-level lapse rates and a healthy coverage of diurnal cumulus today. Benign conditions continue this evening, with clouds giving way to clear skies tonight as high pressure strengthens and eases farther south into the region. Thi...