Today's barometric pressure in San Francisco, a 48-hour pressure chart, and a migraine risk score based on pressure drops, humidity, and temperature changes.
San Francisco's famous fog is driven by pressure differentials between the cool ocean and warm interior valleys. These daily pressure shifts, combined with the city's microclimates, create a subtly challenging environment for migraine sufferers.
Worst season for migraines: November through March. Winter Pacific storms bring the most significant pressure drops to the Bay Area. The city's famous fog is itself driven by pressure differentials between the cool ocean and warm Central Valley, creating daily pressure oscillations even in calm weather.
Common triggers in San Francisco: Pacific storm fronts, fog-driven daily pressure oscillations, microclimate temperature differentials across the city. San Francisco's famous microclimates mean pressure and temperature can vary significantly within a few miles. The fog that rolls through the Golden Gate represents a measurable pressure event each time, and residents in different neighborhoods may experience different trigger levels on any given day.
Typical pressure: San Francisco averages 1016 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 1001 hPa. Swings of 8-14 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
Can San Francisco weather trigger migraines?
Yes. San Francisco experiences 8-14 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include Pacific storm fronts, fog-driven daily pressure oscillations, microclimate temperature differentials across the city.
What time of year are migraines worst in San Francisco?
In San Francisco the most barometrically volatile stretch of the year falls in November through March. That is when weather is most likely to play a part, if weather is a trigger for you at all.
How do I track migraine triggers in San Francisco?
Use MigrAid to log your attacks with one tap. The app automatically records barometric pressure, temperature, and humidity at the time of each migraine, then finds patterns between your attacks and San Francisco's weather conditions over time.
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Is it really the weather?
Weather gets blamed for a lot of migraines, but it's hard to know if it's really behind yours. The MigrAid app saves the barometric pressure with every migraine you log, so after a few weeks you can see whether San Francisco's swings actually line up with your attacks, and get a heads-up on days that match your pattern.