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.
Tonight
35°F
Cloudy
Cloudy. Low around 35, with temperatures rising to around 38 overnight. Northwest wind 15 to 20 mph, with gusts as high as 35 mph.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 35°F | Cloudy | 15 to 20 mph NW | 9% |
| Wednesday | 45°F | Chance Rain Showers | 15 to 20 mph NW | 32% |
| Wednesday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph NW | 17% |
| Thursday | 48°F | Partly Sunny | 10 to 15 mph NNW | 3% |
| Thursday Night | 29°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Friday | 49°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Friday Night | 32°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 58°F | Sunny | 5 to 10 mph W | 3% |
| Saturday Night | 35°F | Mostly Clear | 5 to 10 mph W | 2% |
| Sunday | 61°F | Sunny | 10 mph SW | 0% |
| Sunday Night | 41°F | Mostly Clear | 10 to 15 mph SW | 0% |
| Monday | 61°F | Sunny | 10 to 15 mph NW | 0% |
| Monday Night | 38°F | Partly Cloudy | 5 mph WNW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
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 Nov 4, 2026.