Today's barometric pressure in Bozeman, a 48-hour pressure chart, and a risk score for weather-triggered migraine and headache, based on pressure drops, humidity, and temperature changes.
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Bozeman sits at 1,468 metres in the Gallatin Valley, ringed by four mountain ranges. Baseline pressure near 852 hPa is among the lowest in this dataset, and the surrounding peaks give the valley a weather pattern distinct from the plains to the east.
Worst season for migraines: January, February and December. Midwinter is the most active period, when Pacific systems crossing the Continental Divide meet Arctic air spilling down from Canada. The valley's enclosed shape means each system's effects linger longer than they would on open ground.
Common triggers in Bozeman: dry frontal passages with no precipitation, very low baseline pressure at 1,468 metres, Arctic air spilling over the divide. Air arriving from the west has already crossed multiple ranges by the time it reaches the Gallatin Valley, losing moisture at each one but retaining its pressure signature. That produces frequent dry frontal passages, changes people feel without any accompanying weather to explain them. At this elevation the atmosphere is thin enough that the same system registers more noticeably than it would at sea level.
Typical pressure: Bozeman averages 852 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 836 hPa. Swings of 7-10 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Bozeman is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Bozeman weather trigger migraines?
Yes. Bozeman experiences 7-10 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include dry frontal passages with no precipitation, very low baseline pressure at 1,468 metres, Arctic air spilling over the divide.
What time of year are migraines worst in Bozeman?
In Bozeman the most barometrically volatile stretch of the year falls in January, February and December. That is when weather is most likely to play a part, if weather is a trigger for you at all. See when migraine weather season starts across the U.S.
Is there a barometric pressure headache forecast for Bozeman?
This page works as one. Many people call a headache that arrives with a weather change a barometric pressure headache, and this forecast tracks the pressure drops, humidity and temperature swings behind that idea. The score covers the next 24 hours in Bozeman and the chart shows the next 48. It is built on migraine research, so treat it as a rough guide for other headaches. A sudden, severe headache needs urgent medical care, whatever the weather.
Your own forecast
This page shows the weather risk for everyone in Bozeman. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Bozeman's swings really line up with your attacks, and alerts you when conditions match your own trigger history.