Weather and Migraines

If a migraine creeps in when the sky turns heavy before a storm, you’re not imagining it, and you’re far from alone. Weather is one of the most commonly reported migraine triggers, and there’s real science behind why. This guide walks through what researchers have actually found, where the evidence is strong, and where it’s genuinely uncertain.

Why weather sets off migraines

The migraine brain is, in a sense, a brain that dislikes change. Sudden shifts in sleep, meals, hormones, stress, and sensory input can all tip a susceptible person into an attack. The atmosphere is just another source of change, and a powerful one, because it acts on your whole body at once.

The leading idea is that changes in barometric (atmospheric) pressure affect the balance between the air around you and the fluid- and air-filled spaces inside your head, like the sinuses. When outside pressure drops quickly, the way it does ahead of rain and storms, that small imbalance may be enough to set off the cascade of nerve and blood-vessel changes that produces a migraine in sensitive people.

What researchers have found

A few findings come up again and again:

• Falling barometric pressure is linked to attacks. In one frequently cited study, migraines most often occurred when pressure fell by roughly 6–10 hPa from the standard sea-level pressure of about 1013 hPa, the kind of drop that comes with an approaching low-pressure system (Okuma et al., 2015).
• Temperature matters, especially warming. A large emergency-department study found that higher temperature in the 24 hours beforehand raised the short-term risk of severe headache, with lower barometric pressure adding to the effect (Mukamal et al., 2009).
• The effect is real but modest, and personal. Careful diary studies have sometimes found only weak or inconsistent links between day-to-day weather and migraine (Zebenholzer et al., 2011), which fits the reality that some people are highly weather-sensitive and others aren’t at all.

So the science backs up what many patients report, while also explaining why a friend with migraine might shrug and say weather never bothers them.

Weather triggers for most people

Factor	Strength of evidence	What seems to trigger attacks
Barometric pressure	Strongest	Rapid drops, especially as storms approach
Temperature	Moderate	Rising temperature; sharp swings and cold fronts
Humidity	Weakest	Large swings, usually only alongside other changes

This is also how the Migraine Weather app weights its risk model: pressure first, temperature second, humidity only as a contributing factor. The guides below go into the detail.

Keep reading

• Barometric Pressure and Migraines: What the Research Actually Says, the mechanism and the studies, in plain language.
• What Barometric Pressure Triggers Migraines?, the specific numbers, in hPa and inHg.
• Why Do I Get a Migraine Before It Rains?, what’s actually happening in the hours before a storm.

What you can do about it

You can’t change the weather, but you can stop being ambushed by it. If you suspect weather sets off your migraines, the most useful thing you can do is track your attacks alongside the conditions at the time. That’s the only way to learn your personal pattern. Over a few weeks you’ll start to see whether pressure drops, heat, or storm fronts line up with your bad days, and you can plan around the forecast.