Today's barometric pressure in Phoenix, 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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Phoenix's extreme heat and low humidity might seem stable, and for pressure they mostly are. Monsoon season from June through September brings dust storms and sudden humidity, and the 40-degree daily temperature swing between day and night is another common trigger.
Worst season for migraines: January and February. The North American Monsoon transforms Phoenix's summer weather, with humidity jumping from single digits to 50-60%, but pressure barely moves then, 2% of days or fewer in each summer month. No month reaches the 35% of days our index uses for a trigger season. Winter storms bring the most drops, with a 5 hPa drop on 25% of days in January.
Common triggers in Phoenix: brief monsoon pressure dips, extreme daily temperature swings of 30-40 degrees, dust storms reducing air quality. Phoenix's desert basin traps heat and creates strong surface low-pressure during summer afternoons. The 40-degree daily temperature swing between predawn lows and afternoon highs is one of the largest of any major US city, creating a daily cycle of atmospheric change that sensitive individuals may notice.
Typical pressure: Phoenix averages 974 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 966 hPa. Swings of 3-7 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Phoenix ranks #84 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can Phoenix weather trigger migraines?
Yes. Phoenix experiences 3-7 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 pressure dips, extreme daily temperature swings of 30-40 degrees, dust storms reducing air quality.
What time of year are migraines worst in Phoenix?
In Phoenix the most barometrically volatile stretch of the year falls in January and February. 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 Phoenix?
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 Phoenix 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 Phoenix. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Phoenix's swings really line up with your attacks, and alerts you when conditions match your own trigger history.