Today's barometric pressure in Allentown, 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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Allentown sits in the Lehigh Valley between Blue Mountain and South Mountain, a corridor that channels weather southwest to northeast. Pressure averages 1005 hPa at 103 metres, with cold-season swings reaching 14 hPa.
Worst season for migraines: February, December and January. The valley catches both coastal storms riding up from the mid-Atlantic and systems crossing the Appalachians from the Ohio Valley. Winter storms frequently arrive as mixed precipitation because the valley sits right at the transition zone.
Common triggers in Allentown: boundary stalling along Blue Mountain, mixed precipitation and ice events, dual approach from coastal and Ohio Valley tracks. Blue Mountain to the north acts as a partial barrier to cold air, which means the Lehigh Valley often sits on the warm side of a boundary while areas just beyond the ridge sit on the cold side. Storms stalling on that boundary hold pressure depressed over the valley for extended periods, and ice events are more common here than either side of the ridge.
Typical pressure: Allentown averages 1005 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 987 hPa. Swings of 7-14 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
2026 index: Allentown is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Allentown weather trigger migraines?
Yes. Allentown experiences 7-14 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include boundary stalling along Blue Mountain, mixed precipitation and ice events, dual approach from coastal and Ohio Valley tracks.
What time of year are migraines worst in Allentown?
In Allentown the most barometrically volatile stretch of the year falls in February, December 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 Allentown?
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 Allentown 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 Allentown. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Allentown's swings really line up with your attacks, and alerts you when conditions match your own trigger history.