Today's barometric pressure in Eureka, 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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Eureka takes the full force of North Pacific storms with no landmass upwind to weaken them. Its swing range of 4 to 10 hPa is the widest on the California coast, and Humboldt Bay keeps humidity high enough that the air rarely dries out at all.
Worst season for migraines: March, February and January. From late autumn into early spring the city sits squarely in the Pacific storm track. Systems arrive at full strength, and back-to-back lows can hold pressure depressed for days rather than hours.
Common triggers in Eureka: North Pacific storm sequences arriving undiminished, persistent maritime humidity above 80 percent, multi-day depressed pressure between fronts. Unlike the rest of California, Eureka has no meaningful dry season and no marine layer that burns off. Summer fog persists most days, keeping the temperature range unusually narrow while the barometer does most of the moving. The Cascadia coastline also means storms often stall against the King Range rather than passing cleanly through.
Typical pressure: Eureka 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 4-10 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Eureka is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Eureka weather trigger migraines?
Yes. Eureka 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 North Pacific storm sequences arriving undiminished, persistent maritime humidity above 80 percent, multi-day depressed pressure between fronts.
What time of year are migraines worst in Eureka?
In Eureka the most barometrically volatile stretch of the year falls in March, February and January. 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 Eureka?
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 Eureka 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 Eureka. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Eureka's swings really line up with your attacks, and alerts you when conditions match your own trigger history.