St. Charles, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Winona County, Minnesota.
Today
75°F
Mostly Cloudy then Scattered Rain Showers
Scattered rain showers after 3pm. Mostly cloudy. High near 75, with temperatures falling to around 71 in the afternoon. Northwest wind 7 to 12 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Mostly Cloudy then Scattered Rain Showers | 7 to 12 mph NW | 31% |
| Tonight | 57°F | Scattered Rain Showers then Mostly Cloudy | 7 mph W | 38% |
| Wednesday | 75°F | Mostly Sunny | 5 mph NW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 3 mph W | 0% |
| Thursday | 79°F | Sunny | 3 to 8 mph SW | 0% |
| Thursday Night | 61°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 | 12 mph SW | 15% |
| Saturday | 83°F | Mostly Sunny | 10 mph SW | 14% |
| 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 | 8 mph SE | 39% |
| Monday | 81°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) 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 Aug 4, 2026.