Eureka, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Eureka weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Light Drizzle33%0.01″72°53°—
- FridayJun 5Overcast——68°49°-4°
- SaturdayJun 6Overcast16%—61°44°-7°
- SundayJun 7Light Drizzle21%—59°38°-2°
- MondayJun 8Overcast——66°40°+7°
- TuesdayJun 9Overcast33%—71°41°+5°
- WednesdayJun 10Drizzle49%0.14″56°50°-15°
PM2.5/PM10 ratio 0.53 with 6 mph wind — characteristic of long-range haze transport rather than a local source. AQI down 6 over the last 6 hours (steady decline since this morning).
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 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5/PM10 ratio 0.53 with 6 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.53
- 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
- 6:46 AM
- Moonset
- 3:14 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Eureka at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: June 8 (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.