Mountain Plains, SD Weather & Growing Conditions
Tonight
51°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 2am, then showers and thunderstorms. Cloudy. Low around 51, with temperatures rising to around 53 overnight. East wind 3 to 7 mph, with gusts as high as 17 mph. Chance of precipitation is 80%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Showers And Thunderstorms Likely | 3 to 7 mph E | 80% |
| Sunday | 58°F | Showers And Thunderstorms | 6 mph E | 89% |
| Sunday Night | 47°F | Showers And Thunderstorms | 0 to 5 mph E | 79% |
| Monday | 61°F | Rain Showers Likely | 0 to 5 mph E | 65% |
| Monday Night | 47°F | Partly Cloudy | 3 to 7 mph SE | 9% |
| Tuesday | 72°F | Sunny | 3 mph SE | 5% |
| Tuesday Night | 55°F | Mostly Clear | 3 to 9 mph S | 4% |
| Wednesday | 76°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph S | 36% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 6 mph S | 13% |
| Thursday | 79°F | Sunny | 5 mph N | 4% |
| Thursday Night | 57°F | Mostly Clear | 2 to 7 mph SE | 3% |
| Friday | 80°F | Mostly Sunny | 8 mph SE | 6% |
| Friday Night | 58°F | Partly Cloudy then Slight Chance Rain Showers | 6 to 10 mph S | 15% |
| Saturday | 76°F | Slight Chance Rain Showers then Sunny | 5 to 8 mph W | 15% |
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 Sep 20, 2026.