Circle, Montana Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Circle weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Drizzle42%0.05″69°48°—
- FridayJun 5Clear——82°50°+13°
- SaturdayJun 6Light Drizzle57%0.01″94°63°+12°
- SundayJun 7Light Drizzle57%—77°52°-17°
- MondayJun 8Heavy Drizzle30%—77°50°0°
- TuesdayJun 9Light Showers28%—83°61°+6°
- WednesdayJun 10Overcast37%—79°59°-4°
Ozone at AQI 42 — peak already passed at 1 PM under overcast skies. AQI up 13 over the last 6 hours (gradual rise). Levels should ease through evening.
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 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 42
- UV peak
- 0.6 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 42
PM × Wind × Precip
PM2.5 at 5.2 µg/m³, PM10 at 7.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.69
- Wind
- calm
- Recent rain
- 1h in last 6h
- Pattern
- background
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
- 6:26 AM
- Moonset
- 3:52 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Circle at a glance
- Today vs. normal: 68°F — typical for the season
- 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 — 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.