Three Forks, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Three Forks weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast10%—75°52°—
- FridayJun 5Overcast——88°48°+13°
- SaturdayJun 6Light Drizzle21%0.01″83°53°-5°
- SundayJun 7Light Rain45%0.19″68°46°-15°
- MondayJun 8Overcast30%—70°43°+2°
- TuesdayJun 9Overcast45%—73°54°+3°
- WednesdayJun 10Drizzle64%—79°49°+6°
Ozone at AQI 500. AQI up 9 over the last 6 hours (gradual rise). Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 500
- UV peak
- 6.9 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 230
PM × Wind × Precip
PM2.5 at 7.1 µg/m³ (AQI 39) with a 0.60 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.60
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:19 AM
- Moonset
- 3:11 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Three Forks at a glance
- Today vs. normal: 71°F — typical for the season
- Last frost: May 21 (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 — Three Forks
SPC has placed Three Forks 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.