Mountain Plains, SD Weather & Growing Conditions
Today
69°F
Areas Of Smoke then Sunny
Areas of smoke before noon. Sunny. High near 69, with temperatures falling to around 67 in the afternoon. North wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Areas Of Smoke then Sunny | 0 to 5 mph N | 2% |
| Tonight | 50°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph S | 18% |
| Wednesday | 77°F | Sunny | 0 to 3 mph W | 6% |
| Wednesday Night | 57°F | Mostly Clear | 5 mph SW | 1% |
| Thursday | 85°F | Sunny | 0 to 5 mph NW | 2% |
| Thursday Night | 62°F | Mostly Clear | 5 mph SW | 1% |
| Friday | 90°F | Sunny | 1 to 5 mph N | 1% |
| Friday Night | 67°F | Mostly Clear | 5 to 8 mph SE | 1% |
| Saturday | 91°F | Sunny | 2 to 8 mph NW | 2% |
| Saturday Night | 65°F | Mostly Clear | 3 to 7 mph SE | 3% |
| Sunday | 91°F | Mostly Sunny | 3 to 8 mph SE | 9% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 1 to 7 mph SE | 16% |
| Monday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 9 mph E | 18% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 2 to 9 mph SE | 38% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mountain Plains, SD
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
Explore more for Mountain Plains, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Spearfish, Sd (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.