St. Charles, MI Weather & Growing Conditions
This Afternoon
71°F
Light Rain
Rain. Cloudy. High near 71, with temperatures falling to around 66 in the afternoon. South wind around 14 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Light Rain | 14 mph S | 87% |
| Tonight | 50°F | Light Rain | 12 mph SW | 27% |
| Thursday | 58°F | Chance Light Rain | 14 mph SW | 26% |
| Thursday Night | 41°F | Light Rain Likely then Mostly Cloudy | 10 mph W | 61% |
| Friday | 50°F | Light Rain Likely | 12 mph NW | 60% |
| Friday Night | 34°F | Light Rain Likely | 10 mph NW | 60% |
| Saturday | 51°F | Mostly Sunny | 9 mph NW | 5% |
| Saturday Night | 31°F | Mostly Clear | 6 mph W | 1% |
| Sunday | 56°F | Sunny | 6 to 13 mph W | 7% |
| Sunday Night | 33°F | Mostly Clear | 5 to 10 mph W | 7% |
| Monday | 58°F | Mostly Sunny | 6 to 12 mph W | 1% |
| Monday Night | 38°F | Mostly Clear | 10 mph WSW | 5% |
| Tuesday | 61°F | Sunny | 7 to 12 mph W | 15% |
| Tuesday Night | 34°F | Partly Cloudy | 3 to 7 mph WNW | 15% |
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 Nov 4, 2026.