Today's barometric pressure in Seattle, a 48-hour pressure chart, and a risk score for weather-triggered migraine and headache, based on pressure drops, humidity, and temperature changes.
Loading live forecast for Seattle...
Seattle's reputation for rain means persistent low-pressure systems throughout fall and winter. While the Pacific Northwest's pressure changes tend to be gradual rather than sharp, the sustained low pressure itself is a trigger for many.
Worst season for migraines: October through March. Seattle's rainy season brings a continuous procession of Pacific low-pressure systems. While individual pressure drops are typically gradual rather than sudden, the sustained low barometric readings over weeks create a chronic trigger environment for migraine sufferers.
Common triggers in Seattle: persistent low-pressure systems, atmospheric river moisture events, rapid clearing after storm passages. Seattle's Puget Sound geography channels Pacific storms through the region, and the Olympic and Cascade mountain ranges create rain shadow effects that vary conditions across the metro area. The city averages 150+ days per year with measurable precipitation, each bringing some degree of pressure change.
Typical pressure: Seattle averages 1010 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 992 hPa. Swings of 6-14 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Seattle ranks #55 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can Seattle weather trigger migraines?
Yes. Seattle experiences 6-14 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include persistent low-pressure systems, atmospheric river moisture events, rapid clearing after storm passages.
What time of year are migraines worst in Seattle?
In Seattle the most barometrically volatile stretch of the year falls in October 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 Seattle?
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 Seattle 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 Seattle. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Seattle's swings really line up with your attacks, and alerts you when conditions match your own trigger history.