St. Charles, MN Weather & Growing Conditions
Today
55°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 4pm. Mostly cloudy. High near 55, with temperatures falling to around 50 in the afternoon. Southwest wind 12 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Mostly Cloudy then Chance Rain Showers | 12 to 15 mph SW | 38% |
| Tonight | 45°F | Rain Showers | 12 to 15 mph W | 78% |
| Thursday | 50°F | Chance Rain Showers then Cloudy | 13 to 16 mph N | 39% |
| Thursday Night | 35°F | Mostly Cloudy | 7 to 12 mph N | 8% |
| Friday | 45°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Friday Night | 28°F | Mostly Clear | 2 mph NW | 0% |
| Saturday | 49°F | Sunny | 2 to 7 mph W | 1% |
| Saturday Night | 35°F | Mostly Clear | 5 to 8 mph W | 3% |
| Sunday | 54°F | Sunny | 6 to 9 mph W | 5% |
| Sunday Night | 36°F | Mostly Clear | 7 mph SW | 0% |
| Monday | 59°F | Mostly Sunny | 7 to 12 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 8 mph W | 0% |
| Tuesday | 57°F | Sunny | 6 mph NW | 0% |
| Tuesday Night | 39°F | Partly Cloudy | 3 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, MN
Last spring frost
Apr 23
First fall frost
Oct 16
Growing season
175 days
Hardiness zone
4b
Explore more for St. Charles, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Minnesota City Dam 5, Mn (16.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.