St. Charles, MN Weather & Growing Conditions
Tonight
52°F
Rain Showers
Rain showers. Cloudy. Low around 52, with temperatures rising to around 55 overnight. Southeast wind 8 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Rain Showers | 8 to 13 mph SE | 82% |
| Wednesday | 55°F | Rain Showers | 8 to 13 mph S | 87% |
| Wednesday Night | 45°F | Rain Showers | 15 mph W | 94% |
| Thursday | 49°F | Rain Showers | 13 to 16 mph N | 76% |
| Thursday Night | 37°F | Mostly Cloudy | 9 to 13 mph N | 10% |
| Friday | 46°F | Partly Sunny | 3 to 9 mph N | 0% |
| Friday Night | 30°F | Partly Cloudy | 2 mph NW | 1% |
| Saturday | 51°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 5 to 8 mph W | 10% |
| Sunday | 57°F | Mostly Sunny | 9 mph W | 10% |
| Sunday Night | 37°F | Mostly Clear | 8 mph SW | 3% |
| Monday | 59°F | Mostly Sunny | 8 to 13 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 8 mph W | 1% |
| Tuesday | 56°F | Sunny | 8 mph W | 1% |
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.