Helena, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Helena weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Drizzle23%0.02″72°53°—
- FridayJun 5Overcast——83°49°+11°
- SaturdayJun 6Light Drizzle20%—85°53°+2°
- SundayJun 7Light Drizzle37%0.03″56°45°-29°
- MondayJun 8Overcast29%—71°41°+15°
- TuesdayJun 9Overcast51%—74°54°+3°
- WednesdayJun 10Light Drizzle49%0.01″67°51°-7°
Ozone at AQI 35. AQI down 6 over the last 6 hours (steady decline since this morning). Overcast through the UV peak window (cloud cover ~65%) — afternoon ozone should stay flat.
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 35. Overcast through the UV peak window (cloud cover ~65%) — afternoon ozone should stay flat.
- Present
- AQI 35
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 6.1 µg/m³, PM10 at 10.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.59
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 6:24 AM
- Moonset
- 3:11 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Helena at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: May 26 (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.