Chester, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Chester weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——72°49°—
- FridayJun 5Overcast——78°48°+6°
- SaturdayJun 6Heavy Drizzle19%0.05″75°54°-3°
- SundayJun 7Light Drizzle23%—62°48°-13°
- MondayJun 8Overcast25%—72°45°+10°
- TuesdayJun 9Overcast31%—72°51°0°
- WednesdayJun 10Drizzle44%0.27″59°50°-13°
PM2.5/PM10 ratio 0.68 with 13 mph wind — characteristic of long-range haze transport rather than a local source. AQI up 5 over the last 6 hours (gradual rise).
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 42 now. With UV 6.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 by mid-afternoon.
- Present
- AQI 42
- UV peak
- 6.2 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5/PM10 ratio 0.68 with 13 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.68
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 6:28 AM
- Moonset
- 2:59 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Chester at a glance
- Today vs. normal: 66°F — typical for the season
- Last frost: June 6 (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 — Chester
SPC has placed Chester in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- 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.