Bull Lake, Montana Weather
Summer heat breaks with monsoon. Day 43 of summer. Read this microseason across nine climate regions →
Bull Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Overcast——73°57°—
- MondayAug 3Overcast——78°55°+5°
- TuesdayAug 4Overcast——85°54°+7°
- WednesdayAug 5Overcast——88°57°+3°
- ThursdayAug 6Overcast——95°63°+7°
- FridayAug 7Overcast——94°65°-1°
- SaturdayAug 8Mostly Clear——89°59°-5°
AQI 77 (Moderate), driven by PM2.5. AQI up 14 over the last 6 hours (gradual rise). PM2.5 at 29.5 µg/m³ (AQI 89) with a 0.91 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.
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 31 now. With UV 2.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10.
- Present
- AQI 31
- UV peak
- 2.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 29.5 µg/m³ (AQI 89) with a 0.91 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.91
- 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).
Red sky at night, sailor's delight.
- Moonrise
- 10:30 PM
- Moonset
- 10:56 AM
- In sign
- ♓︎ Pisces
Summer heat breaks with monsoon
Bull Lake at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: June 4 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
16-Day Forecast — Bull Lake
- Sun73°57°1%
- Mon78°55°6%
- Tue85°54°0%
- Wed88°57°0%
- Thu95°63°0%
- Fri94°65°0%
- Sat89°59°1%
- Sun90°61°2%
- Mon87°59°2%
- Tue90°55°8%
- Wed89°55°8%
- Thu81°55°3%
- Fri86°54°3%
- Sat90°61°3%
- Sun89°61°6%
- Mon84°56°7%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Sun & seasons in Bull Lake
Bull Lake sits in Lincoln County, where the year’s longest day runs 16h 5m of daylight and its shortest just 8h 20m — a swing of +7h 45m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Billings, the state’s largest city, lies about 383 miles to the ESE. The nearest town Bull Lake tracks is Charlo, roughly 95 miles to the SE.
Air quality in Bull Lake’s county has trended cleaner since 2020; its cleanest year on record was 2025 (median AQI 45). See the full air-quality history for Bull Lake.
ZIP codes in Bull Lake
- 59935