Spearfish, SD Weather & Growing Conditions
Tonight
56°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely between 10pm and 3am, then patchy fog and showers and thunderstorms likely. Mostly cloudy, with a low around 56. South wind 0 to 6 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms Likely | 0 to 6 mph S | 66% |
| Saturday | 65°F | Patchy Fog | 0 to 10 mph E | 74% |
| Saturday Night | 53°F | Showers And Thunderstorms Likely | 3 to 12 mph E | 74% |
| Sunday | 60°F | Rain Showers | 3 to 9 mph E | 99% |
| Sunday Night | 50°F | Showers And Thunderstorms | 1 to 12 mph E | 83% |
| Monday | 64°F | Chance Rain Showers | 1 to 13 mph E | 52% |
| Monday Night | 49°F | Partly Cloudy | 3 to 13 mph SE | 13% |
| Tuesday | 75°F | Sunny | 1 to 8 mph SE | 8% |
| Tuesday Night | 55°F | Mostly Clear | 2 to 10 mph SE | 8% |
| Wednesday | 78°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph E | 26% |
| Wednesday Night | 55°F | Mostly Clear | 2 to 6 mph S | 12% |
| Thursday | 79°F | Sunny | 1 to 8 mph NE | 7% |
| Thursday Night | 56°F | Partly Cloudy | 5 to 8 mph SE | 5% |
| Friday | 81°F | Mostly Sunny | 3 to 9 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Spearfish, SD
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
Explore more for Spearfish, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Spearfish, Sd (0.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.