Spearfish, South Dakota Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Spearfish weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast11%—69°55°—
- ThursdayJun 4Overcast28%—80°55°+11°
- FridayJun 5Overcast21%—80°56°0°
- SaturdayJun 6Overcast——94°62°+14°
- SundayJun 7Overcast30%—94°60°0°
- MondayJun 8Overcast30%—74°55°-20°
- TuesdayJun 9Overcast17%—90°63°+16°
Ozone at AQI 41 — peak already passed at 1 PM under partly cloudy skies. AQI flat over the last 6 hours (within ±3 points). Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 41
- UV peak
- 5.0 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 41
PM × Wind × Precip
PM2.5 at 6.3 µg/m³, PM10 at 8.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.75
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 5:07 AM
- Moonset
- 1:38 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Spearfish at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: May 13 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Spearfish
SPC has placed Spearfish in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.