St. Clair, MI Weather & Growing Conditions
Today
83°F
Sunny
Sunny, with a high near 83. South wind 3 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 3 to 9 mph S | 0% |
| Tonight | 59°F | Mostly Clear | 3 to 9 mph S | 0% |
| Wednesday | 86°F | Sunny | 3 to 10 mph SSW | 0% |
| Wednesday Night | 65°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 1 to 8 mph SSW | 17% |
| Thursday | 82°F | Showers And Thunderstorms Likely | 1 to 7 mph WSW | 60% |
| Thursday Night | 62°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph WNW | 60% |
| Friday | 84°F | Chance Showers And Thunderstorms | 3 mph WSW | 47% |
| Friday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph SSW | 44% |
| Saturday | 87°F | Mostly Sunny | 1 to 8 mph SW | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 2 to 7 mph SSW | 31% |
| Sunday | 88°F | Chance Rain Showers | 2 to 12 mph SW | 31% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 43% |
| Monday | 85°F | Chance Rain Showers | 5 to 9 mph W | 43% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 3 to 7 mph WSW | 45% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Clair, MI
Last spring frost
May 3
First fall frost
Oct 18
Growing season
167 days
Hardiness zone
6a
Explore more for St. Clair, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Algonac Wwtp, Mi (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.