Barometric pressure headache forecast

Enter a US ZIP code or use your location. You see the pressure for the next three days and the hours when it falls fastest, the change many people with migraine watch.

or anywhere in the world

Units

A fall of more than 5 hPa (0.15 inHg) in 24 hours is marked: in one year-long study, migraine attacks were more frequent around falls that size.

Pressure forecast

Enter a ZIP code or use your location to see the next three days.

Your ZIP code or rounded location goes to our server, which asks MET Norway for the forecast. We keep no record of who asked.

How it works

The forecast is the sea-level air pressure from MET Norway, the Norwegian national weather service, which publishes a free global forecast. We ask it for the point you chose (a ZIP code becomes the center of that ZIP area, from US Census data) and draw the next 72 hours.

The tool compares every hour with the same hour one day earlier and shows the largest fall. In a year-long diary study of 28 people with migraine in Japan, attacks were more frequent when pressure fell by more than 5 hPa from one day to the next, so falls above 5 hPa are marked.

That was a small study, and many people with migraine notice no link with the weather at all. The only way to know if pressure matters for you is to log your attacks next to it for a few months.

24-hour change = pressure at hour t − pressure at hour t − 24 (hPa). 1 hPa = 0.02953 inHg.

Good to know

Forecasts change. Check again the day before, not a week before.
A fast fall does not mean you will have an attack, and a steady day does not mean you will not.
For a sudden, severe or unusual headache, get medical help right away.

Frequently asked questions

What barometric pressure change causes headaches?

There is no single number. In one year-long study, migraine attacks were more frequent when pressure fell by more than 5 hPa (about 0.15 inHg) from one day to the next. Many people notice no link at all.

Is low pressure or falling pressure the problem?

The same study found no link with the monthly average pressure, only with day-to-day changes. That is why this tool shows the change, not just the level.

How do I know if weather triggers my migraines?

Log every attack with its date and time for a few months, then compare the attacks with the pressure on those days. Miggry does this comparison for you.

Where does the forecast come from?

From MET Norway (the Norwegian Meteorological Institute), under the CC BY 4.0 licence. It covers the whole world and updates several times a day.

Sources

Checked on September 26, 2026.

For the rest, there is Miggry

Miggry lays your attacks next to the pressure.

Log an attack in seconds, and Miggry keeps the pressure, weather, sleep and medication beside it, then shows you which signals really go with your attacks.