East Helena, Montana Weather
Pikas hayfeeding in granite peaks. Day 76 of spring. Read this microseason across nine climate regions →
East Helena weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast12%—74°43°—
- ThursdayJun 4Light Rain27%0.08″70°53°-4°
- FridayJun 5Overcast——85°48°+15°
- SaturdayJun 6Overcast22%—83°53°-2°
- SundayJun 7Heavy Drizzle28%0.20″58°46°-25°
- MondayJun 8Overcast18%—75°39°+17°
- TuesdayJun 9Overcast32%—73°48°-2°
Ozone at AQI 43 now. AQI flat over the last 6 hours (within ±3 points). With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 41 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 43 now. With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 41 by mid-afternoon.
- Present
- AQI 43
- UV peak
- 7.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 41
PM × Wind × Precip
PM2.5 at 6.4 µg/m³ (AQI 36) with a 0.80 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:50 AM
- Moonset
- 2:03 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
East Helena at a glance
- Today vs. normal: 8°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 3, 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 — East Helena
SPC has placed East Helena in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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.