Why Do I Get Migraines Every Time the Weather Changes?

Nine hectopascals. That's how much the barometric pressure fell over Warsaw on a single Tuesday afternoon last October, and that's how much head-pain some of us felt crawling behind the left eye around four in the morning the next day. Maybe you remember the same Tuesday. Maybe for you it wasn't Warsaw, it was Hamburg, or São Paulo, or a small town nobody writes weather stories about — but you woke up and thought, "something shifted," and you were already reaching for the dark glasses before your coffee had finished brewing.

If you're anything like me, you've spent years being told it's stress, or dehydration, or screens, or red wine. And sure, sometimes it is. But you already know the pattern you're tracking is different. You get a migraine when the sky changes, and the sky doesn't care whether you slept well or ate spinach.

The signal you can actually feel

There are three physical variables that push on a migraine-prone nervous system at the same time, and you almost never feel them separately. That's part of the confusion. You notice a bad day and your brain reaches for the nearest obvious cause — the wine last night, the argument yesterday, the missed lunch — when in fact three invisible things were sliding around in the background all along.

The first is barometric pressure — the weight of the air column above your head. When a front moves in, it drops, sometimes fast, and the trigeminal nerve in people with migraine doesn't love that. A 5 or 6 hPa fall across a few hours is enough to be noticeable for sensitive people; a 10 hPa drop is roughly what you'd feel ascending into the foothills of a mountain without the scenery to distract you. The second is the geomagnetic field — disturbed by solar wind, measured globally as the Kp index by NOAA SWPC. When a coronal mass ejection hits Earth, Kp can jump from 2 to 6 in a few hours and that correlates (messily, imperfectly) with migraine onset in people who track their attacks carefully. The third is Schumann resonance, the standing electromagnetic wave humming around the planet between the ground and the ionosphere at roughly 7.83 Hz. It's the weirdest of the three and the one the mainstream still shrugs at, but it moves with solar storms and a small but growing group of researchers is starting to pay attention.

So which one hits you?

Honestly, you probably can't tell from the inside. The inside of a migraine is a nauseous tunnel, and distinguishing "the pressure fell" from "the Kp climbed" from "the Schumann amplitude spiked" is not something your own awareness was built to do. What you can do is check all three at once, after the fact, and look for a pattern over weeks. We built the live score precisely because a normal person trying to chase three different data feeds across four government websites at seven in the morning is going to give up by Wednesday. One number. Calm, Elevated, Active, or Storm. If the reading is Storm and your head is pounding, that's a data point for your pattern. If the reading is Calm and your head is pounding, that's a different kind of data point — maybe today's trigger is something else entirely, and that's useful to know too.

What the research actually says

The honest answer is: weather-migraine research is messy, underfunded, and full of small studies with contradictory conclusions. That's the truth. But it is not nothing.

A 2024 narrative review in Current Pain and Headache Reports (Denney, Lee, and Joshi, PMID 38358443) surveyed the weather-migraine literature and landed on a sobering estimate: weather variables account for roughly a fifth of reported migraine triggers across studies. Not the headline story. A meaningful slice, though, and your slice. An earlier narrative review in the same journal (Maini and Schuster, 2019, PMID 31707623) zeroed in on barometric pressure specifically and found exactly the messy pattern you might guess — multiple studies, inconsistent directionality, and a real effect clearly present in a subset of patients that does not reproduce across the general migraine population. That is actually the most important sentence in the literature for you: there is a subgroup, and you might be in it.

The American Migraine Foundation, which is not in the business of hyping fringe claims, lists weather changes as a "common trigger" in roughly one-third of people with migraine. One in three. Not everybody, not imagination.

What you do not see in the literature — and this is worth saying out loud — is a clean, mechanistic, reproducible explanation for why pressure does what it does to the trigeminal nerve. The leading hypothesis involves air trapped in the sinuses expanding and contracting as external pressure changes, pulling on pain-sensitive structures. A competing hypothesis points at the inner ear and vestibular system, which would also explain why vestibular migraine sufferers report weather sensitivity at even higher rates. Both could be partly right. Neither is settled. When you read a confident claim online about the exact mechanism, your antenna should go up.

Why today might be a bad day (or a good one)

Here is the thing that most medical advice skips: even if you've identified weather as a trigger, you almost never act on it. You don't know what today is doing until the migraine has already landed and you're reverse-engineering the why.

Suppose it's a Wednesday morning in late October. You check today's reading on your phone before you even get out of bed. If the score is 40 — Elevated, green-gold — you drink water, you eat breakfast, you go about your day, and you don't worry. If the score is 83 — Storm, deep red — you take your preventive seriously, you skip the second espresso, you tell your boss that yes you'll make the 10 a.m. meeting but please no fluorescent conference room. This is not magic. This is a person who has a reliable trigger and a live gauge for it, behaving like a person with diabetes behaves around a glucose monitor. Boring. Practical. Effective on its own days.

The three sungeo.net stations feeding the Schumann side of the score — Tomsk in Siberia, ETNA on Sicily, and Cumiana near Turin — are a deliberate geographic spread so one local storm over Europe doesn't poison the global reading. The NOAA Kp feed is updated every three hours. Barometric pressure is pulled for 32 cities across four regions. You don't have to read any of that. You just have to glance at the number. But it helps to know what's underneath it, because then on the morning you feel weird and the number says Calm, you trust your body and not the dashboard.

A rhetorical detour, because the next section is going to sound like a disclaimer and I want to get ahead of it: does any of this replace your neurologist, your triptan, your magnesium, your sleep hygiene?

No.

What this does not mean

Weather is not the only cause of your migraines, and nobody who understands migraine biology would claim it was. Migraine is a complex neurological disorder with genetic components, hormonal components, neurovascular components, and a long roster of triggers — food, sleep debt, hormonal cycles, alcohol, bright light, specific smells, dehydration, stress release after a deadline. Most people who track carefully find three to five reliable triggers, and weather is usually one of them, not the only one.

The research is also honest about its limits. The NIH NINDS headache page notes that while many patients report weather sensitivity, objective laboratory confirmation is still elusive, partly because you can't exactly run a randomized controlled trial on a thunderstorm. The effect sizes in most observational studies are modest. And individual response is wildly heterogeneous — one person's Storm day is another person's totally-fine day, even with identical readings.

The live-data approach is not "the weather predicts your migraine." It is "the weather is one readable input among several, and now you can see it without a PhD in atmospheric physics." Different claim, smaller claim, more honest claim.

A small thing you can try today

Pick one morning this week — ideally a morning where you feel a slight hum of discomfort but no full attack yet — and look up the live score the moment you wake up. Screenshot it. Then later that day, if the migraine lands or doesn't land, write the outcome in a note app. Date, score, outcome. That's it. Three fields.

Do that for three weeks. Twenty-one data points. After that, you will know more about your own weather sensitivity than any generic guide could ever tell you, and you'll know it specifically for you, not for the statistical average of a 300-person Cephalalgia study.

If you want to go deeper, the headache forecast page shows the 7-day trend, so you can see whether you're heading into a Storm stretch before it arrives. People who commute, travel, or schedule important meetings ahead of time use it differently than people who just want a morning glance. Use it the way it actually helps you.

The ugly truth about chronic weather-triggered migraine is that you have been gaslit about it for a long time — by friends, sometimes by doctors, occasionally by the little voice in your own head that says you're being dramatic. You're not. The pressure really did drop nine hectopascals. The Kp really did climb from 2 to 5. Your trigeminal nerve really did notice before your conscious mind did. The nervous system you live in is doing its job, and its job includes being a very sensitive barometer. What's changed is that now, finally, you can check the same barometer it's checking.