St. Charles, SD Weather & Growing Conditions
Tonight
34°F
Cloudy
Cloudy. Low around 34, with temperatures rising to around 37 overnight. Northwest wind 15 to 20 mph, with gusts as high as 30 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Cloudy | 15 to 20 mph NW | 7% |
| Wednesday | 45°F | Chance Rain Showers | 15 to 20 mph NW | 30% |
| Wednesday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph NW | 19% |
| Thursday | 48°F | Partly Sunny | 5 to 15 mph NNW | 3% |
| Thursday Night | 28°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Friday | 49°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Friday Night | 31°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 59°F | Sunny | 5 to 10 mph W | 3% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WNW | 2% |
| Sunday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Sunday Night | 41°F | Mostly Clear | 10 mph SW | 0% |
| Monday | 61°F | Sunny | 5 to 15 mph NW | 0% |
| Monday Night | 37°F | Partly Cloudy | 5 mph WNW | 0% |
| Tuesday | 59°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, SD
Last spring frost
May 3
First fall frost
Oct 10
Growing season
159 days
Hardiness zone
5a
Explore more for St. Charles, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Bonesteel, Sd (7.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.