Santa Ana Winds and Migraine: California Trigger

If you live in Southern California, you already know the feeling. The air turns dry. The temperature jumps. The wind picks up, and somewhere behind your eyes, a familiar pressure starts to build. Santa Ana winds are a real migraine trigger for many people, and a growing body of research explains why.²

These winds do not act through just one path. They bring sudden heat, a sharp drop in humidity, fast pressure changes, and sometimes wildfire smoke, all at once. For a brain prone to migraine, that is a lot of change to handle in a single day.

Here is what the research says about why Santa Ana winds affect people with migraine, and what you can do about it.

Key takeaways

• Santa Ana winds are dry, warm winds that blow from the desert toward the California coast. A large 2026 study found that heat, dry air, and spikes in air pollution combine to raise migraine risk in another desert climate, which mirrors what happens during a Santa Ana event.¹
• Foehn winds, warm dry winds that form the same way Santa Ana winds do, have been linked to a higher risk of weather-related hospital visits during hot spells, according to a 2025 Swiss study.³
• Santa Ana winds are not one trigger. They are several triggers stacked together: heat, dehydration, pressure change, dust, and sometimes smoke.
• Santa Ana wind events can bring off-season heat waves and power shutoffs meant to prevent wildfires, which can leave people without air conditioning right when they need it most.⁴
• Wildfire smoke appears to carry more health risk than everyday air pollution. A 2024 San Diego County study found more emergency department visits after exposure to wildfire-specific fine particles than after similar exposure to fine particles from other sources.⁵
• You cannot stop the wind. You can lower your overall migraine threshold so it takes more to set off an attack.

Do Santa Ana winds really trigger migraine attacks?

For many people with migraine, yes. Santa Ana winds are strong, warm, dry winds that blow from inland deserts down toward the Southern California coast, usually in fall and winter. People across Los Angeles, Orange County, and San Diego commonly report headaches, sinus pain, and full migraine attacks when the winds pick up.

Direct research on Santa Ana winds and migraine is still limited, but the pieces around it keep adding up. A 2026 study that followed more than 7,000 people with migraine in a desert region of Israel for over two decades found that heat and low humidity made spikes in air pollution a stronger trigger for migraine attacks, while cold, damp weeks made fine-particle pollution hit harder.¹ Santa Ana winds create a similar hot, dry, pollution-shifting environment along the Southern California coast, so this research offers a reasonable, though not proven, explanation for why people notice the same pattern here.

Santa Ana winds also share their basic physics with foehn winds, a general term for warm, dry winds that form when air is forced down the side of a mountain range. A 2025 Swiss study found that these winds raised the risk of weather-related hospitalization, especially when they brought high heat.³ That heat-and-dryness combination is exactly what a Santa Ana event brings to the coast.

What is happening during a Santa Ana wind event?

Santa Ana winds form when high pressure builds over the Great Basin, the dry region east of the Sierra Nevada. Air flows from that high-pressure area down toward the coast. As it drops in elevation, the air compresses and heats up, and it loses whatever moisture it had. By the time it reaches the coast, it is hot, bone-dry, and moving fast.

This single event changes several things around you at once:

• Temperature often jumps well above the seasonal average, sometimes within hours.
• Humidity can fall from a comfortable range down into the single digits.
• Barometric pressure shifts as the wind pattern moves through.
• Dust and pollen get lifted into the air and carried long distances.
• Wildfire risk rises sharply, since dry vegetation and strong wind are the two ingredients fire needs most.

Any one of these changes could be a mild threshold-raiser on its own. Together, they can add up fast.

Why do dry, warm winds set off migraine?

There is no single confirmed mechanism. Several plausible pathways likely act together.

Heat and dehydration. A sudden jump in temperature raises your body's demand for fluids. Dehydration is a well-known migraine trigger on its own. Santa Ana wind events can trigger off-season heat waves in Southern California, and the power shutoffs utilities use to prevent wind-driven wildfires can leave people without air conditioning right when temperatures spike, which makes staying hydrated and cool even harder.⁴

Fast drops in humidity. Your sinuses and nasal passages are used to a certain moisture level. When humidity drops quickly, those tissues dry out and become irritated, which can refer pain into the same trigeminal nerve pathways involved in migraine. This is one reason Santa Ana winds are so closely tied to sinus pressure and headache, not just classic migraine.

Pressure changes. Like other regional wind events, Santa Ana winds move through as pressure systems shift. A 2024 review of weather and migraine found that variables like pressure, humidity, and wind are tied to migraine risk in some studies, but the overall effect is modest and inconsistent from one person to the next.⁷

Dust and airborne particles. Strong wind lifts fine dust, pollen, and other irritants into the air. Some people with migraine are sensitive to strong smells and airborne irritants, which can activate the same trigeminal pathway that carries migraine pain.

Wildfire smoke, when a fire is burning. This part is easy to overstate, so it is worth being precise. A 2025 review of the Los Angeles wildfires found that Santa Ana winds usually improve air quality by sweeping pollution out over the ocean, but when a wildfire is actively burning, the same winds instead carry smoke and fine particles into populated areas, sometimes far from the fire itself.⁴ That smoke may carry more risk than everyday pollution. A 2024 San Diego County study found people were more likely to visit the emergency department after exposure to wildfire-specific fine particles than after similar exposure to fine particles from other sources.⁵ A 2023 systematic review of 12 studies and more than 4 million participants found a consistent link between fine particle air pollution and migraine activity, so a Santa Ana wind combined with active fire smoke is the higher-risk combination, not the wind alone.⁶

Note: these factors have not been studied as a single package specifically for Santa Ana winds. The table reflects the individual, separately verified effects of heat, humidity, pressure, and air pollution on migraine, applied to what happens during a typical Santa Ana wind event.

What about "positive ions"? A note on a popular theory

You may have heard that Santa Ana winds carry an excess of positive ions, and that this charge in the air is what triggers headaches and low mood. This idea is old, and it shows up often in California folklore about the winds.

The honest answer is that the science behind it is weak. The original studies on air ions and mood or headache are decades old, small, and have not been reliably repeated with modern methods. It is not something Haven can confirm or recommend basing your prevention plan on. The heat, dehydration, dryness, and pressure changes that come with Santa Ana winds have much stronger and more current evidence behind them, and they are also things you can act on.

How to protect yourself before and during a Santa Ana wind event

You cannot stop the wind. You can lower your baseline threshold so it takes more to tip you into an attack.

Watch the forecast, not just the wind. Wind advisories are issued a day or more ahead. Use that lead time. If you know a Santa Ana event is coming, that is the day to be strict about sleep, meals, and hydration, not the day to let things slide.

Hydrate ahead of time, not just during. Dry air pulls moisture from your body through your skin and breath, often before you feel thirsty. Start increasing fluids the day before a forecast wind event, not after your mouth feels dry.

Protect your sinuses. A saline nasal rinse or spray helps keep nasal tissue from drying out and becoming irritated. If you are indoors often during the event, a humidifier in your bedroom can help.

Reduce dust and pollen exposure. Keep windows closed during high-wind hours. Wraparound sunglasses cut down on both bright light and airborne particles reaching your eyes, two triggers in one step.

Check air quality if there is an active fire. Santa Ana winds and wildfires often arrive together in fall. If a fire is burning anywhere upwind, check the Air Quality Index before planning outdoor time, and run a HEPA air purifier indoors if smoke moves in.

Keep your acute medication within reach. If you already know Santa Ana events are a personal trigger, having your acute treatment on hand and using it early in an attack works better than waiting.

Track the pattern. Log wind events in your headache diary alongside your usual triggers. Over one or two Santa Ana seasons, this will tell you whether wind itself is your trigger, or whether it is really the heat, the dryness, or the smoke riding along with it. That distinction changes what you should focus on preventing.

When to see a headache specialist

If Santa Ana wind season reliably brings on attacks that disrupt your work, sleep, or daily life, that pattern is worth bringing to a headache specialist. A clinician can help you separate which part of the wind event is really driving your attacks, build a plan for high-risk wind days, and decide whether your overall attack frequency warrants a preventive treatment, not just a plan for acute days.

At Haven Headache & Migraine Center, we build prevention plans around your real triggers, including the seasonal and regional ones that are easy for other providers to dismiss.

Book a virtual consultation with Haven

Frequently asked questions

Do Santa Ana winds really trigger migraine attacks?

For many people, yes. Santa Ana winds share their basic mechanism with foehn winds, and they create the same hot, dry, pollution-shifting conditions that recent research has linked to more migraine activity in other desert climates.

Why do Santa Ana winds cause headaches?

Santa Ana winds combine several triggers at once: a fast rise in temperature, a sharp drop in humidity, shifting pressure, and airborne dust. Any of these alone can raise your migraine risk. Together, they add up quickly.

Is it the wind, the heat, or the dry air that triggers migraine?

It is likely a combination, and this can differ from person to person. Heat and dehydration, sudden dryness, and pressure changes have all been separately linked to more migraine and headache activity. Tracking wind events in a headache diary can help you learn which part matters most for you.

Do Santa Ana winds make wildfire smoke worse for migraine?

Only when a fire is actively burning. Research shows Santa Ana winds usually clear pollution from the air by pushing it out to sea. The real risk is a Santa Ana wind event that coincides with an active wildfire, which can carry smoke and fine particles into populated areas, and that smoke may carry more health risk than everyday air pollution.

Do positive ions from Santa Ana winds cause migraine?

This is a popular idea, but the scientific evidence behind it is old, weak, and has not held up to modern research. The heat, dehydration, dryness, and pressure shifts that come with Santa Ana winds have much stronger evidence and are also easier to manage.

What can I do before a Santa Ana wind event to prevent an attack?

Start hydrating the day before a forecast event, use a saline nasal spray to protect your sinuses, keep windows closed during peak wind hours, and check air quality if any wildfire is burning nearby. Keep your acute medication accessible in case an attack starts anyway.

‍Medically reviewed by Alicia Chang, MSN, APRN, FNP-BC, FNP-C, CEN, PHN, Haven Headache & Migraine Center and peer-reviewed by Karissa Secora, DMSc, PA-C, AQH

References

1. Peles I, Novack L, Gordon M, Sarov B, Novack V, Ifergane G. Acute Environmental Triggers and Intermediate-Term Modulators of Emergency Migraine-Related Health Care Encounters. Neurology. 2026;106(9):e214936. https://doi.org/10.1212/WNL.0000000000214936
2. American Migraine Foundation. Migraine Triggers. https://americanmigrainefoundation.org/resource-library/migraine-triggers/
3. Saucy A, et al. The risk of hospitalization associated with foehn winds and temperature in the mountainous region of Switzerland. Environmental Epidemiology. 2025;9(5):e418. https://doi.org/10.1097/EE9.0000000000000418
4. Benmarhnia T, Errett NA, Casey JA. Beneath the smoke: understanding the public health impacts of the Los Angeles urban wildfires. Environmental Epidemiology. 2025;9(3):e388. https://doi.org/10.1097/EE9.0000000000000388
5. Schwarz L, Nguyen A, Schwarz E, et al. Effects of fine particulate matter from wildfire and non-wildfire sources on emergency-department visits in people who were housed and unhoused in San Diego County (CA, USA) during 2012-20: a time-stratified case-crossover study. Lancet Planetary Health. 2024;8(11):e906-e914. https://doi.org/10.1016/S2542-5196(24)00239-0
6. Portt A, Orchard C, Chen H, et al. Migraine and air pollution: A systematic review. Headache. 2023;63(9). https://doi.org/10.1111/head.14632
7. Denney DE, Lee J, Joshi S. Whether Weather Matters with Migraine. Current Pain and Headache Reports. 2024;28(4):181-187. https://doi.org/10.1007/s11916-024-01216-8

This article is for general education and is not medical advice. It is not a substitute for care from a qualified health professional. Always talk with your clinician before starting, stopping, or changing any treatment. If you have a sudden, severe headache, the worst headache of your life, or a headache with new symptoms like weakness, trouble speaking, or vision loss, seek emergency care right away.

Living with headache or migraine? The specialists at Haven Headache & Migraine Center are here to help. Book a virtual consultation.

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