Circle, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Circle weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Light Drizzle31%0.01″72°49°—
- FridayJun 5Overcast——83°50°+11°
- SaturdayJun 6Light Drizzle55%0.01″95°65°+12°
- SundayJun 7Light Drizzle55%0.01″71°51°-24°
- MondayJun 8Overcast40%—83°47°+12°
- TuesdayJun 9Overcast13%—88°65°+5°
- WednesdayJun 10Overcast39%—88°63°0°
PM2.5 at 8.0 µg/m³ (AQI 44) with a 0.88 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 8 over the last 6 hours (steady decline since this morning).
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 8.0 µg/m³ (AQI 44) with a 0.88 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.88
- 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
- 6:00 AM
- Moonset
- 2:40 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Circle at a glance
- Today vs. normal: 19°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 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 — Circle
SPC has placed Circle in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3SLGTSlight Risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.