Today's barometric pressure in Key West, 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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Key West sits at the end of the Florida Keys, a metre above sea level and surrounded by warm shallow water. Its swing range of 4 to 5 hPa is the narrowest in this entire dataset, and the barometer here can sit nearly motionless for weeks.
Worst season for migraines: February, January and March. Very few fronts reach this far south, and the handful that do arrive weakened. What limited barometric variation exists concentrates in the cool months, making each event stand out sharply against an unusually flat baseline.
Common triggers in Key West: hurricane approach pressure collapse, persistent trade wind humidity, rare cool-season frontal arrivals. Surrounded by water on every side, the island has an exceptionally narrow temperature range, rarely dropping below 18C or rising above 33C. That stability makes tropical systems the dominant weather event by a wide margin. A hurricane approach produces a pressure fall unlike anything else the city experiences, sometimes exceeding 40 hPa, against a baseline that otherwise barely moves.
Typical pressure: Key West averages 1016 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 1008 hPa. Swings of 4-5 hPa over 24 hours are typical here, mostly below the 5 hPa drops our index counts.
2026 index: Key West is not one of the 100 metros ranked in our 2026 U.S. Migraine Risk Index, which shows how they compare.
Can Key West weather trigger migraines?
It can, though that is rare here. Key West usually sees 4-5 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include hurricane approach pressure collapse, persistent trade wind humidity, rare cool-season frontal arrivals.
What time of year are migraines worst in Key West?
In Key West the most barometrically volatile stretch of the year falls in February, January and March. 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 Key West?
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 Key West 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 Key West. The MigrAid app learns yours. It saves the barometric pressure, humidity and temperature with every migraine you log, shows whether Key West's swings really line up with your attacks, and alerts you when conditions match your own trigger history.