Today's barometric pressure in Peoria, 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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Peoria sits in the Illinois River valley at 153 metres, where the river has cut a broad trench through the surrounding prairie. Pressure averages 998 hPa, and the valley walls create measurable differences between the bluffs and the river flats.
Worst season for migraines: February, January and March. Central Illinois sits under the main winter storm track, so the cold months bring a steady sequence of passages. The severe weather season that follows in spring adds a second period of rapid changes, typically peaking in April and May.
Common triggers in Peoria: river valley cold air pooling and fog, unobstructed prairie storm transit, spring severe weather along the Illinois valley. Sixty metres or more below the surrounding prairie, the Illinois River valley pools cold air overnight and produces fog when the flats and bluffs differ in temperature. Storm systems crossing the state are unobstructed by terrain, so pressure changes arrive quickly, but the valley microclimate adds local variation on top of the regional pattern.
Typical pressure: Peoria averages 998 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 982 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: Peoria is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Peoria weather trigger migraines?
Yes. Peoria 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 river valley cold air pooling and fog, unobstructed prairie storm transit, spring severe weather along the Illinois valley.
What time of year are migraines worst in Peoria?
In Peoria the most barometrically volatile stretch of the year falls in February, January and 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 Peoria?
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 Peoria 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 Peoria. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Peoria's swings really line up with your attacks, and alerts you when conditions match your own trigger history.