St. Charles, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Winona County, Minnesota.
Overnight
58°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 58. East wind 12 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Showers And Thunderstorms | 12 to 15 mph E | 89% |
| Saturday | 64°F | Showers And Thunderstorms Likely | 7 to 10 mph E | 55% |
| Saturday Night | 54°F | Slight Chance Showers And Thunderstorms then Cloudy | 8 to 12 mph NE | 21% |
| Sunday | 66°F | Partly Sunny | 14 mph NE | 3% |
| Sunday Night | 49°F | Mostly Cloudy | 8 to 12 mph E | 4% |
| Monday | 62°F | Mostly Cloudy | 10 mph NE | 13% |
| Monday Night | 44°F | Mostly Cloudy | 8 mph E | 8% |
| Tuesday | 61°F | Mostly Sunny | 8 mph E | 4% |
| Tuesday Night | 41°F | Mostly Clear | 6 mph E | 1% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 47°F | Mostly Clear | 3 mph SE | 4% |
| Thursday | 66°F | Mostly Sunny | 5 mph SE | 8% |
| Thursday Night | 50°F | Partly Cloudy | 3 mph SE | 4% |
| Friday | 69°F | Mostly Sunny | 5 mph SE | 4% |
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.