Today's barometric pressure in Flagstaff, 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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At nearly 7,000 feet on the Colorado Plateau, Flagstaff has one of the lowest baseline barometric pressures of any US city. The city's mountain climate brings snow, monsoons, and dramatic daily temperature swings that each carry pressure implications.
Worst season for migraines: January through April, plus October. Flagstaff's 7,000-foot elevation on the Colorado Plateau creates a mountain climate unusual for Arizona. Pacific storms bring heavy snow and most of the year's pressure drops, peaking in March, when 42% of days see a 5 hPa drop. The summer monsoon brings daily thunderstorms but little pressure movement, 10% of days or fewer in each summer month.
Common triggers in Flagstaff: brief monsoon thunderstorm pressure dips at high altitude, Pacific winter storm frontal passages with heavy snowfall, extreme UV radiation at 7,000 feet. Flagstaff sits at 7,000 feet at the base of the 12,600-foot San Francisco Peaks, the highest point in Arizona. Despite being in the same state as Phoenix, Flagstaff's climate is radically different, with 100+ inches of annual snowfall and summer temperatures 30 degrees cooler. The Mogollon Rim escarpment to the south acts as a trigger zone for monsoon thunderstorms, and the ponderosa pine forests surrounding the city moderate some weather effects but also contribute pollen and wildfire smoke triggers.
Typical pressure: Flagstaff averages 790 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 775 hPa. Swings of 4-8 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Flagstaff ranks #3 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can Flagstaff weather trigger migraines?
Yes. Flagstaff experiences 4-8 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include brief monsoon thunderstorm pressure dips at high altitude, Pacific winter storm frontal passages with heavy snowfall, extreme UV radiation at 7,000 feet.
What time of year are migraines worst in Flagstaff?
In Flagstaff the most barometrically volatile stretch of the year falls in January through April, plus October. 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 Flagstaff?
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 Flagstaff 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 Flagstaff. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Flagstaff's swings really line up with your attacks, and alerts you when conditions match your own trigger history.