Helena Valley West Central, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Helena Valley West Central weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast18%—70°53°—
- FridayJun 5Mostly Clear——83°49°+13°
- SaturdayJun 6Overcast20%—79°51°-4°
- SundayJun 7Light Rain41%0.18″56°42°-23°
- MondayJun 8Overcast17%—69°36°+13°
- TuesdayJun 9Light Drizzle59%—69°52°0°
- WednesdayJun 10Overcast56%—79°49°+10°
Ozone at AQI 46 now. AQI up 7 over the last 6 hours (gradual rise). With UV 5.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 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 46 now. With UV 5.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 by mid-afternoon.
- Present
- AQI 46
- UV peak
- 5.8 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 7.8 µg/m³, PM10 at 10.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.73
- Wind
- breezy
- 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
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Helena Valley West Central at a glance
- Today vs. normal: 5°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.
SPC Convective Outlook
Storm Prediction Center — Helena Valley West Central
SPC has placed Helena Valley West Central 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.