Spearfish, SD Weather & Growing Conditions
Today
50°F
Partly Sunny
Partly sunny. High near 50, with temperatures falling to around 44 in the afternoon. Northwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Partly Sunny | 7 mph NW | 0% |
| Tonight | 30°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 55°F | Mostly Sunny | 2 to 6 mph SE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 7 mph SW | 0% |
| Friday | 52°F | Mostly Sunny | 3 to 8 mph W | 0% |
| Friday Night | 36°F | Mostly Clear | 5 to 12 mph SW | 0% |
| Saturday | 57°F | Sunny | 8 to 18 mph W | 0% |
| Saturday Night | 37°F | Mostly Clear | 9 mph SW | 0% |
| Sunday | 67°F | Sunny | 9 mph SW | 0% |
| Sunday Night | 43°F | Mostly Clear | 3 to 12 mph SW | 0% |
| Monday | 60°F | Sunny | 2 to 6 mph W | 0% |
| Monday Night | 38°F | Partly Cloudy | 5 mph SW | 1% |
| Tuesday | 60°F | Mostly Sunny | 2 to 7 mph W | 0% |
| Tuesday Night | 41°F | Partly Cloudy | 7 mph SW | 1% |
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 Nov 4, 2026.