Today's barometric pressure in Long Beach, 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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Long Beach sits behind Catalina Island in a stretch of coast where the marine layer holds pressure unusually steady. Daily swings average about 4 hPa, among the flattest readings in the country, and the sharpest changes arrive with winter frontal systems.
Worst season for migraines: January through March. Pacific frontal systems reach the Southern California bight mainly in midwinter. Outside that window the semi-permanent Pacific high parks offshore and holds conditions close to flat for months at a time.
Common triggers in Long Beach: winter frontal passages off the Pacific, Catalina eddy marine layer deepening, offshore Santa Ana reversals in autumn. Catalina eddy circulation, a counterclockwise flow that forms in the bight, deepens the marine layer and can shift local pressure independently of the larger regional pattern. Port workers and residents near the water often notice attacks tied to eddy days rather than to any storm on the forecast.
Typical pressure: Long Beach averages 1013 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 1006 hPa. Swings of 4-6 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Long Beach is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Long Beach weather trigger migraines?
Yes. Long Beach experiences 4-6 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include winter frontal passages off the Pacific, Catalina eddy marine layer deepening, offshore Santa Ana reversals in autumn.
What time of year are migraines worst in Long Beach?
In Long Beach the most barometrically volatile stretch of the year falls in January 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 Long Beach?
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 Long Beach 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 Long Beach. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Long Beach's swings really line up with your attacks, and alerts you when conditions match your own trigger history.