Today's barometric pressure in San Antonio, 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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San Antonio's position between the Gulf Coast and the Texas Hill Country means competing air masses regularly clash overhead. Spring cold fronts pushing through warm, humid Gulf air create some of the sharpest pressure drops in the state.
Worst season for migraines: December through March. San Antonio's pressure drops come mostly with winter fronts pushing toward the Gulf, from December through March, peaking in January, when 47% of days see a 5 hPa drop. Spring brings severe storms as Gulf moisture meets dry Pacific air over the Hill Country, and fall tropical moisture can bring flooding rains, but those months see far fewer drops. Summer is far calmer, at 4% of days or fewer.
Common triggers in San Antonio: dry line thunderstorm development, Gulf moisture surges, rapid temperature drops during blue northers. San Antonio sits at the ecological boundary between the humid Gulf Coast and the semi-arid Hill Country. This transition zone means competing air masses regularly converge overhead, making the city's weather more volatile than either region alone.
Typical pressure: San Antonio averages 992 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 981 hPa. Swings of 4-10 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: San Antonio ranks #62 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can San Antonio weather trigger migraines?
Yes. San Antonio experiences 4-10 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include dry line thunderstorm development, Gulf moisture surges, rapid temperature drops during blue northers.
What time of year are migraines worst in San Antonio?
In San Antonio the most barometrically volatile stretch of the year falls in December through March. 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 San Antonio?
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 San Antonio 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 San Antonio. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether San Antonio's swings really line up with your attacks, and alerts you when conditions match your own trigger history.