St. Charles, MN Weather & Growing Conditions
Today
75°F
Mostly Cloudy then Scattered Rain Showers
Scattered rain showers after 3pm. Mostly cloudy. High near 75, with temperatures falling to around 72 in the afternoon. Northwest wind 7 to 10 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Mostly Cloudy then Scattered Rain Showers | 7 to 10 mph NW | 30% |
| Tonight | 57°F | Scattered Rain Showers then Mostly Cloudy | 3 to 7 mph W | 36% |
| Wednesday | 75°F | Mostly Sunny | 5 mph NW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 3 mph W | 0% |
| Thursday | 80°F | Sunny | 3 to 8 mph SW | 0% |
| Thursday Night | 60°F | Mostly Clear | 8 mph S | 1% |
| Friday | 82°F | Sunny | 8 to 13 mph SW | 10% |
| Friday Night | 64°F | Slight Chance Rain Showers | 8 to 12 mph SW | 16% |
| Saturday | 83°F | Slight Chance Rain Showers then Mostly Sunny | 7 to 10 mph SW | 15% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 10 mph SW | 39% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 10 mph SW | 39% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 5 to 8 mph S | 39% |
| Monday | 82°F | Chance Rain Showers | 8 mph E | 39% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 8 mph N | 25% |
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 Aug 4, 2026.