Arco, Idaho Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Arco weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——78°47°—
- ThursdayJun 4Overcast——76°61°-2°
- FridayJun 5Clear——79°55°+3°
- SaturdayJun 6Overcast——78°54°-1°
- SundayJun 7Light Drizzle—0.02″65°50°-13°
- MondayJun 8Overcast——63°46°-2°
- TuesdayJun 9Overcast12%—57°47°-6°
Ozone at AQI 45 now. AQI up 15 in the last 6 hours — air quality is degrading. With UV 0.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 11 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 45 now. With UV 0.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 11 by mid-afternoon.
- Present
- AQI 45
- UV peak
- 0.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5/PM10 ratio 0.57 with 6 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.57
- 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
- 6:17 AM
- Moonset
- 3:27 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Arco at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: May 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.