48-hour migraine risk based on barometric pressure, humidity, and temperature changes in San Jose.
San Jose benefits from the Santa Clara Valley's sheltered geography, but atmospheric rivers in winter bring sustained pressure drops. The Bay Area's microclimates mean conditions can vary significantly within a short drive.
Worst season for migraines: November through March. Winter Pacific storms push through the Santa Clara Valley bringing the bulk of San Jose's annual pressure variability. The valley's sheltered position between the Santa Cruz Mountains and the Diablo Range moderates many systems, but atmospheric rivers can still deliver sharp drops.
Common triggers in San Jose: Pacific atmospheric river events, temperature inversions trapping poor air quality, rapid post-storm clearing and pressure rebounds. San Jose sits at the southern end of San Francisco Bay in a broad valley that traps warm air and pollution during temperature inversions. The Santa Cruz Mountains block some marine influence from the west, giving San Jose warmer, drier conditions than San Francisco just 50 miles north, but also trapping particulate matter that acts as a secondary migraine trigger.
Typical pressure: San Jose averages 1015 hPa at rest, but storm systems can push readings down to 1002 hPa. Swings of 7-13 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
Can San Jose weather trigger migraines?
Yes. San Jose experiences 7-13 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include Pacific atmospheric river events, temperature inversions trapping poor air quality, rapid post-storm clearing and pressure rebounds.
What time of year are migraines worst in San Jose?
Migraine sufferers in San Jose typically report the highest attack frequency during November through March. This aligns with the period of greatest barometric volatility in the region.
How do I track migraine triggers in San Jose?
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 Jose's weather conditions over time.
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