St. Charles, MI Weather & Growing Conditions
Tonight
51°F
Light Rain Likely
Rain likely. Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. East northeast wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Light Rain Likely | 5 to 9 mph ENE | 56% |
| Saturday | 66°F | Showers And Thunderstorms Likely | 3 to 8 mph ESE | 76% |
| Saturday Night | 54°F | Showers And Thunderstorms Likely | 5 to 9 mph E | 71% |
| Sunday | 68°F | Chance Rain Showers | 8 to 15 mph NE | 33% |
| Sunday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 9 to 15 mph NE | 28% |
| Monday | 64°F | Mostly Cloudy | 12 to 16 mph NE | 5% |
| Monday Night | 46°F | Mostly Cloudy | 10 to 16 mph NE | 5% |
| Tuesday | 63°F | Partly Sunny | 12 to 16 mph NE | 10% |
| Tuesday Night | 48°F | Chance Rain Showers | 9 to 16 mph NE | 33% |
| Wednesday | 64°F | Chance Rain Showers | 13 mph NE | 40% |
| Wednesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 5 to 13 mph NE | 28% |
| Thursday | 67°F | Partly Sunny | 6 to 10 mph NNE | 10% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 10 mph NNE | 8% |
| Friday | 70°F | Mostly Sunny | 3 to 9 mph N | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, MI
Last spring frost
Apr 29
First fall frost
Oct 21
Growing season
175 days
Hardiness zone
6a
Explore more for St. Charles, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Saginaw #3, Mi (13.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.