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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

WhenTempForecastWindPrecip
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

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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.