Helena Valley Southeast, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Helena Valley Southeast weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Light Drizzle19%—72°54°—
- FridayJun 5Overcast——82°49°+10°
- SaturdayJun 6Light Drizzle37%—80°53°-2°
- SundayJun 7Light Snow Shwrs48%0.27″60°45°-20°
- MondayJun 8Overcast20%—72°40°+12°
- TuesdayJun 9Light Drizzle61%0.01″73°54°+1°
- WednesdayJun 10Overcast63%—79°51°+6°
Ozone at AQI 500 — peak already passed at 1 PM under partly cloudy skies. AQI up 18 in the last 6 hours — air quality is degrading. Levels should ease through evening.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 500
- UV peak
- 4.3 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 500
PM × Wind × Precip
PM2.5 at 5.6 µg/m³, PM10 at 7.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.80
- Wind
- windy
- 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
- 6:23 AM
- Moonset
- 3:10 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Helena Valley Southeast at a glance
- Today vs. normal: 4°F above 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 Southeast
SPC has placed Helena Valley Southeast 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.