St. Charles, SD Weather & Growing Conditions
Today
70°F
Scattered Rain Showers
Scattered rain showers before 3pm. Mostly cloudy, with a high near 70. North northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Scattered Rain Showers | 5 to 10 mph NNW | 28% |
| Tonight | 53°F | Partly Cloudy | 0 to 5 mph W | 4% |
| Wednesday | 77°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Wednesday Night | 58°F | Mostly Clear | 10 mph S | 1% |
| Thursday | 86°F | Sunny | 10 to 20 mph S | 7% |
| Thursday Night | 64°F | Mostly Clear | 15 to 20 mph S | 7% |
| Friday | 91°F | Sunny | 10 to 15 mph SSW | 5% |
| Friday Night | 66°F | Mostly Clear | 5 to 10 mph S | 7% |
| Saturday | 95°F | Sunny | 10 to 25 mph S | 3% |
| Saturday Night | 67°F | Mostly Clear | 10 to 20 mph S | 7% |
| Sunday | 92°F | Mostly Sunny | 10 to 20 mph ESE | 3% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 20 mph E | 19% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 10 to 20 mph ENE | 19% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 to 20 mph ENE | 16% |
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 Aug 4, 2026.