Hamilton, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Hamilton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast21%—71°54°—
- FridayJun 5Overcast——79°49°+8°
- SaturdayJun 6Overcast——71°48°-8°
- SundayJun 7Light Snow Shwrs41%0.12″59°40°-12°
- MondayJun 8Light Drizzle27%—73°41°+14°
- TuesdayJun 9Light Drizzle67%0.05″71°50°-2°
- WednesdayJun 10Overcast61%—77°53°+6°
Ozone at AQI 44. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
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 44. Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
- Present
- AQI 44
- UV peak
- 6.6 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5 at 6.7 µg/m³ (AQI 37) with a 0.71 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.71
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:31 AM
- Moonset
- 3:21 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Hamilton at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: May 24 (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.