Today's barometric pressure in McAllen, 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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McAllen sits in the Rio Grande Valley at the southern tip of Texas, close enough to the Gulf that maritime air dominates year-round. Pressure averages 1010 hPa, and the subtropical setting means humidity rarely falls far enough to give the air a break.
Worst season for migraines: January and March, with February close behind. Only a handful of fronts reach this far south each cool season, which is exactly why each one stands out against so stable a baseline. Hurricane season introduces the opposite pattern, with tropical systems producing the deepest falls of the year.
Common triggers in McAllen: stalled frontal boundaries over the Valley, tropical system pressure falls, year-round high humidity. Fronts that arrive in the Valley have travelled the entire length of Texas and often stall here, leaving the boundary parked overhead for days. That produces prolonged periods of shifting pressure rather than a single clean passage. Between events, near-constant humidity above 70 percent forms a baseline that many residents find as significant as the changes themselves.
Typical pressure: McAllen 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 999 hPa. Swings of 5-10 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: McAllen is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can McAllen weather trigger migraines?
Yes. McAllen experiences 5-10 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include stalled frontal boundaries over the Valley, tropical system pressure falls, year-round high humidity.
What time of year are migraines worst in McAllen?
In McAllen the most barometrically volatile stretch of the year falls in January and March, with February close behind. 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 McAllen?
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 McAllen 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 McAllen. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether McAllen's swings really line up with your attacks, and alerts you when conditions match your own trigger history.