St. Charles, MI Weather & Growing Conditions
This Afternoon
64°F
Slight Chance Showers And Thunderstorms
A chance of rain showers before 5pm, then a slight chance of showers and thunderstorms. Cloudy, with a high near 64. East wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Slight Chance Showers And Thunderstorms | 8 mph E | 45% |
| Tonight | 57°F | Patchy Fog | 5 to 8 mph ENE | 78% |
| Sunday | 70°F | Chance Rain Showers then Mostly Cloudy | 7 to 13 mph NE | 45% |
| Sunday Night | 50°F | Mostly Cloudy | 8 to 13 mph NE | 2% |
| Monday | 63°F | Mostly Cloudy | 10 to 14 mph NE | 2% |
| Monday Night | 46°F | Mostly Cloudy | 8 to 14 mph NE | 3% |
| Tuesday | 63°F | Partly Sunny | 8 to 15 mph ENE | 3% |
| Tuesday Night | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph ENE | 19% |
| Wednesday | 64°F | Chance Rain Showers | 14 mph ENE | 37% |
| Wednesday Night | 49°F | Chance Rain Showers | 7 to 13 mph ENE | 37% |
| Thursday | 67°F | Partly Sunny | 7 to 10 mph ENE | 8% |
| Thursday Night | 48°F | Mostly Cloudy | 2 to 8 mph ENE | 8% |
| Friday | 71°F | Partly Sunny | 3 to 8 mph NE | 7% |
| Friday Night | 47°F | Partly Cloudy | 1 to 8 mph NNE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, MI
Last spring frost
May 1
First fall frost
Oct 15
Growing season
164 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, Owosso Wwtp, Mi (17.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.