Today's barometric pressure in Boise, 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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Boise's high desert climate at 2,700 feet brings dry conditions with significant daily temperature ranges. Pacific weather systems lose much of their moisture crossing the Cascades but retain their pressure influence, creating dry but barometrically active conditions.
Worst season for migraines: October through April. Pacific storm systems that cross the Cascades and Blue Mountains deliver winter weather to the Boise basin. The Treasure Valley's bowl-shaped geography traps cold air during winter inversions, creating persistent fog and stagnant conditions that can last for weeks.
Common triggers in Boise: Treasure Valley winter inversions trapping cold air and pollution, Chinook wind events from the Cascades, rapid spring pressure changes during Pacific storm passages. Boise sits at 2,700 feet in the Treasure Valley along the Boise River, surrounded by foothills that rise steeply to the north and east. The valley's enclosed geography makes it prone to severe winter inversions where cold, polluted air becomes trapped below the mountain rim, sometimes for weeks. These inversions create a persistent low-ceiling, stagnant-air environment that compounds migraine triggers. When inversions break, the pressure and temperature shift can be dramatic.
Typical pressure: Boise averages 921 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 907 hPa. Swings of 6-11 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Boise ranks #24 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can Boise weather trigger migraines?
Yes. Boise experiences 6-11 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include Treasure Valley winter inversions trapping cold air and pollution, Chinook wind events from the Cascades, rapid spring pressure changes during Pacific storm passages.
What time of year are migraines worst in Boise?
In Boise the most barometrically volatile stretch of the year falls in October through April. 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 Boise?
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 Boise 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 Boise. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Boise's swings really line up with your attacks, and alerts you when conditions match your own trigger history.