St. Charles, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a community in Gregory County, South Dakota.
This Afternoon
73°F
Mostly Cloudy
Mostly cloudy, with a high near 73. North northwest wind 5 to 10 mph.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Cloudy | 5 to 10 mph NNW | 1% |
| Tonight | 60°F | Mostly Cloudy then Patchy Fog | 5 to 10 mph N | 6% |
| Saturday | 66°F | Patchy Fog then Cloudy | 10 to 15 mph N | 14% |
| Saturday Night | 56°F | Slight Chance Rain Showers | 10 mph NNE | 21% |
| Sunday | 60°F | Rain Showers | 10 to 15 mph NE | 77% |
| Sunday Night | 53°F | Rain Showers | 10 mph ENE | 85% |
| Monday | 58°F | Rain Showers | 10 mph ENE | 85% |
| Monday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph E | 15% |
| Tuesday | 64°F | Mostly Cloudy | 10 to 15 mph SE | 13% |
| Tuesday Night | 52°F | Mostly Cloudy | 10 to 15 mph SE | 12% |
| Wednesday | 68°F | Chance Rain Showers | 15 to 20 mph SSE | 25% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 15 mph SSE | 39% |
| Thursday | 69°F | Chance Rain Showers | 10 mph SSE | 39% |
| Thursday Night | 56°F | Mostly Cloudy | 10 mph SSE | 13% |
Forecast source: National Weather Service (api.weather.gov) for St. Charles (43.088, -99.095). Updated through the day.
Growing snapshot for St. Charles
Last spring frost
May 3
First fall frost
Oct 10
Growing season
159 days
Hardiness zone
5a
More local growing data for St. Charles: nearby ZIP 57571 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Bonesteel, Sd (7.5 mi from St. Charles). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.