St. Charles, MN Weather & Growing Conditions
Tonight
57°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 57. East wind 12 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Showers And Thunderstorms | 12 to 16 mph E | 91% |
| Saturday | 66°F | Showers And Thunderstorms | 7 to 10 mph E | 87% |
| Saturday Night | 55°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 42% |
| Sunday | 65°F | Mostly Cloudy | 13 mph NE | 9% |
| Sunday Night | 49°F | Mostly Cloudy | 10 mph E | 6% |
| Monday | 61°F | Mostly Cloudy then Chance Rain Showers | 10 mph E | 32% |
| Monday Night | 45°F | Chance Rain Showers | 8 mph NE | 32% |
| Tuesday | 60°F | Partly Sunny | 8 mph E | 11% |
| Tuesday Night | 44°F | Partly Cloudy | 5 mph E | 5% |
| Wednesday | 64°F | Sunny | 5 mph E | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 3 mph SE | 6% |
| Thursday | 67°F | Partly Sunny | 3 mph S | 10% |
| Thursday Night | 51°F | Partly Cloudy | 2 mph S | 8% |
| Friday | 69°F | Mostly Sunny | 2 to 6 mph SE | 5% |
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 Sep 19, 2026.