St. Charles, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Winona County, Minnesota.
Tonight
58°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 58. East wind 12 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Showers And Thunderstorms | 12 to 17 mph E | 91% |
| Saturday | 66°F | Showers And Thunderstorms | 10 mph E | 87% |
| Saturday Night | 55°F | Chance Showers And Thunderstorms | 12 mph NE | 42% |
| Sunday | 65°F | Mostly Cloudy | 13 mph NE | 9% |
| Sunday Night | 50°F | Mostly Cloudy | 8 to 12 mph E | 7% |
| Monday | 61°F | Mostly Cloudy then Chance Rain Showers | 10 mph E | 33% |
| Monday Night | 45°F | Chance Rain Showers | 8 mph NE | 33% |
| Tuesday | 60°F | Partly Sunny | 8 mph E | 12% |
| Tuesday Night | 44°F | Partly Cloudy | 5 mph E | 5% |
| Wednesday | 64°F | Sunny | 5 mph E | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 3 mph SE | 6% |
| Thursday | 67°F | Partly Sunny | 3 mph S | 10% |
| Thursday Night | 51°F | Partly Cloudy | 3 mph S | 8% |
| Friday | 69°F | Mostly Sunny | 5 mph SE | 5% |
Forecast source: National Weather Service (api.weather.gov) for St. Charles (43.969, -92.059). Updated through the day.
Growing snapshot for St. Charles
Last spring frost
Apr 23
First fall frost
Oct 16
Growing season
175 days
Hardiness zone
4b
More local growing data for St. Charles: nearby ZIP 55972 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Altura
Elba
Goodview
Homer
Lewiston
Minneiska
Minnesota City
Pickwick
Rollingstone
Stockton
Utica
Winona
Climate data from the nearest NOAA station, Minnesota City Dam 5, Mn (16.5 mi from St. Charles). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.