Great Falls, Montana Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Great Falls weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Overcast——80°48°—
- SaturdayJun 6Overcast47%—76°54°-4°
- SundayJun 7Light Rain47%0.16″59°45°-17°
- MondayJun 8Overcast34%—72°41°+13°
- TuesdayJun 9Drizzle58%0.02″69°49°-3°
- WednesdayJun 10Light Drizzle58%0.02″59°40°-10°
- ThursdayJun 11Overcast57%—69°45°+10°
AQI 31 (Good), driven by PM2.5. AQI down 14 over the last 6 hours (steady decline since this morning). PM2.5 at 4.7 µg/m³ (AQI 26) with a 0.90 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 4.7 µg/m³ (AQI 26) with a 0.90 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.90
- 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
- 6:50 AM
- Moonset
- 4:15 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Great Falls at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: May 31 (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 5, 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 — Great Falls
SPC has placed Great Falls 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.