Dillon, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Dillon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——76°50°—
- FridayJun 5Overcast——84°48°+8°
- SaturdayJun 6Light Drizzle15%—79°50°-5°
- SundayJun 7Light Rain42%0.07″63°46°-16°
- MondayJun 8Overcast13%—69°44°+6°
- TuesdayJun 9Light Drizzle41%0.01″63°49°-6°
- WednesdayJun 10Light Drizzle59%0.02″76°44°+13°
Ozone at AQI 75 now. AQI up 10 over the last 6 hours (gradual rise). With UV 7.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 50 by mid-afternoon.
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 75 now. With UV 7.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 50 by mid-afternoon.
- Present
- AQI 75
- UV peak
- 7.1 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 50
PM × Wind × Precip
PM2.5/PM10 ratio 0.56 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.56
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 6:20 AM
- Moonset
- 3:18 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Dillon at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: May 17 (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 — Dillon
SPC has placed Dillon in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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.