Today's barometric pressure in St. Louis, a 48-hour pressure chart, and a risk score for weather-triggered migraine and headache, based on pressure drops, humidity, and temperature changes.
Loading live forecast for St. Louis...
St. Louis sits at the confluence of the Missouri and Mississippi rivers, a geographic crossroads for weather systems. The city's central US location means exposure to both tropical Gulf moisture and Arctic cold fronts, often in the same week.
Worst season for migraines: November through April. St. Louis sits at the confluence of the Mississippi and Missouri rivers where severe weather corridors overlap. Pressure drops are most frequent from November through April, peaking in March, when 60% of days see a 5 hPa drop as spring storm systems begin to replace winter fronts. Summer is far calmer, at 18% of days or fewer.
Common triggers in St. Louis: Mississippi Valley severe thunderstorm development, river valley humidity trapping in summer, rapid cold front passages with 30-degree temperature drops. St. Louis occupies the American Bottom where the Missouri River flows into the Mississippi, creating a broad floodplain that channels moisture and weather systems. The Ozark foothills to the southwest provide minimal terrain interference, and the river valleys act as humidity reservoirs that enhance storm development. The city's position at the intersection of multiple storm tracks makes it one of the more barometrically volatile metros in the central US.
Typical pressure: St. Louis averages 1000 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 985 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: St. Louis ranks #40 of 100 in our 2026 U.S. Migraine Risk Index, where #1 is the most challenging city for weather-driven migraine.
Can St. Louis weather trigger migraines?
Yes. St. Louis 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 Mississippi Valley severe thunderstorm development, river valley humidity trapping in summer, rapid cold front passages with 30-degree temperature drops.
What time of year are migraines worst in St. Louis?
In St. Louis the most barometrically volatile stretch of the year falls in November through April. 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 St. Louis?
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 St. Louis 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 St. Louis. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether St. Louis's swings really line up with your attacks, and alerts you when conditions match your own trigger history.