Today's barometric pressure in Ann Arbor, 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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Ann Arbor sits at 269 metres in the Huron River valley, on rolling terrain west of Detroit. Pressure averages 984 hPa, and its inland position means it misses most of the lake moderation that keeps the lakeshore milder.
Worst season for migraines: February, March and December. Late winter and early spring bring the largest barometric moves, when systems tracking through the Great Lakes are at their most frequent. The interior position means colder outcomes and sharper transitions than the shoreline sees from the same storms.
Common triggers in Ann Arbor: continental air mass exposure between the lakes, glacial terrain frost pockets, rapid late-winter transitions. Southeast Michigan sits between Lakes Michigan and Huron without being close enough to either for strong lake effect, which leaves it exposed to the full continental pattern. The Huron valley's rolling glacial terrain produces local frost pockets and temperature variation across short distances, noticeable to anyone tracking conditions closely.
Typical pressure: Ann Arbor averages 984 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 965 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: Ann Arbor is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Ann Arbor weather trigger migraines?
Yes. Ann Arbor 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 continental air mass exposure between the lakes, glacial terrain frost pockets, rapid late-winter transitions.
What time of year are migraines worst in Ann Arbor?
In Ann Arbor the most barometrically volatile stretch of the year falls in February, March and December. 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 Ann Arbor?
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 Ann Arbor 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 Ann Arbor. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Ann Arbor's swings really line up with your attacks, and alerts you when conditions match your own trigger history.