Boulder, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Boulder weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Heavy Drizzle17%0.05″75°42°—
- ThursdayJun 4Light Rain28%0.14″68°50°-7°
- FridayJun 5Overcast——79°48°+11°
- SaturdayJun 6Overcast31%—82°51°+3°
- SundayJun 7Heavy Drizzle35%0.04″65°42°-17°
- MondayJun 8Overcast23%—66°40°+1°
- TuesdayJun 9Light Drizzle37%—67°47°+1°
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. AQI up 11 over the last 6 hours (gradual rise). Levels should ease through evening.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 500
- UV peak
- 0.9 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 500
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:22 AM
- Moonset
- 3:12 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Boulder at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: May 23 (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 4, 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 — Boulder
SPC has placed Boulder in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
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.