St. Charles, SD Weather & Growing Conditions
Tonight
55°F
Chance Rain Showers
A chance of rain showers before 10pm, then patchy fog between midnight and 1am, then a slight chance of rain showers between 3am and 5am, then a chance of rain showers and patchy fog. Cloudy, with a low around 55. Northeast wind around 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Chance Rain Showers | 10 mph NE | 29% |
| Sunday | 58°F | Rain Showers | 10 to 15 mph NE | 89% |
| Sunday Night | 51°F | Showers And Thunderstorms | 5 to 10 mph ENE | 96% |
| Monday | 56°F | Rain Showers | 10 mph ENE | 96% |
| Monday Night | 45°F | Mostly Cloudy | 5 to 10 mph E | 9% |
| Tuesday | 61°F | Partly Sunny | 5 to 15 mph SE | 7% |
| Tuesday Night | 50°F | Mostly Cloudy | 10 to 15 mph SE | 11% |
| Wednesday | 64°F | Slight Chance Rain Showers | 15 to 20 mph SSE | 24% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 15 to 20 mph SSE | 50% |
| Thursday | 71°F | Chance Rain Showers | 10 to 15 mph S | 50% |
| Thursday Night | 56°F | Mostly Cloudy | 5 to 10 mph SE | 10% |
| Friday | 71°F | Partly Sunny | 5 to 15 mph SE | 10% |
| Friday Night | 59°F | Mostly Cloudy then Chance Rain Showers | 15 mph SE | 28% |
| Saturday | 71°F | Chance Rain Showers | 15 to 20 mph SSE | 31% |
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 Sep 20, 2026.