St. Charles, MI Weather & Growing Conditions
Today
71°F
Light Rain
Rain. Mostly cloudy. High near 71, with temperatures falling to around 68 in the afternoon. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Light Rain | 14 to 17 mph S | 96% |
| Tonight | 50°F | Chance Light Rain then Mostly Cloudy | 9 to 13 mph SSW | 45% |
| Thursday | 58°F | Mostly Cloudy then Slight Chance Light Rain | 12 to 15 mph SW | 24% |
| Thursday Night | 40°F | Light Rain Likely | 3 to 9 mph W | 63% |
| Friday | 50°F | Light Rain Likely | 6 to 12 mph NNW | 63% |
| Friday Night | 33°F | Light Rain Likely | 7 to 10 mph NNW | 60% |
| Saturday | 51°F | Partly Sunny | 9 mph NW | 7% |
| Saturday Night | 30°F | Partly Cloudy | 6 mph W | 1% |
| Sunday | 56°F | Mostly Sunny | 7 to 14 mph W | 7% |
| Sunday Night | 32°F | Partly Cloudy | 5 to 10 mph W | 7% |
| Monday | 58°F | Mostly Sunny | 5 to 12 mph WSW | 1% |
| Monday Night | 38°F | Partly Cloudy | 10 mph WSW | 5% |
| Tuesday | 61°F | Mostly Sunny | 8 to 13 mph W | 7% |
| Tuesday Night | 33°F | Partly Cloudy | 2 to 9 mph WNW | 7% |
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 Nov 4, 2026.