Hays, Montana Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Hays weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Showers31%0.21″63°50°—
- FridayJun 5Overcast——71°52°+8°
- SaturdayJun 6Drizzle42%0.01″74°53°+3°
- SundayJun 7Heavy Rain56%0.42″61°41°-13°
- MondayJun 8Overcast41%—70°44°+9°
- TuesdayJun 9Heavy Drizzle40%0.11″73°55°+3°
- WednesdayJun 10Light Drizzle41%0.06″64°53°-9°
AQI 42 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 6.1 µg/m³ (AQI 34) with a 0.84 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
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 30 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 7 by mid-afternoon.
- Present
- AQI 30
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 6.1 µg/m³ (AQI 34) with a 0.84 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.84
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 6:41 AM
- Moonset
- 4:03 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Hays at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: June 3 (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
Warm-season window is open
As of June 5, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
SPC Convective Outlook
Storm Prediction Center — Hays
SPC has placed Hays in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.