About this site
If your head or your joints seem to know the weather is changing before the forecast does, you're in good company. Search your city below to see the barometric pressure where you are — two days back, up to sixteen ahead — with the fast swings flagged, since those are what many people feel most. Curious how it all works? There's a FAQ at the bottom.
Choose a location
Type at least 2 letters, then use ↑ ↓ and Enter to select.
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calm shifting rapid swing
How to read the chart above
The shaded area on the left is the past 2 days, leading up to the dashed now line. Line colour shows how fast pressure is moving, and the dot on each chip in the day strip shows that day's worst swing in the same colours. The soft band around the line is the spread between several weather models — the tighter the band, the more confident the forecast. The faint horizontal tints behind the line are the pressure bands:
Pressure map
Colours show sea-level pressure; the lines are isobars. Interactive map by Windy.com.
The map's colour scale only shows hPa/mbar — in inHg its key values are:
Questions people ask
Why does barometric pressure trigger headaches and joint pain?
Nobody knows for certain — and anyone who says otherwise is forecasting beyond their data. The leading ideas: falling pressure may let tissues expand slightly, irritating sensitive joints, and pressure changes may affect the fluid-filled spaces of the inner ear and sinuses, which some researchers link to migraine onset. What is well documented is that many people consistently report symptoms arriving with pressure swings — which is reason enough to see them coming.
What counts as a big barometric pressure swing?
There's no official cutoff, but studies on weather-related migraine often look at changes of a few hectopascals within hours. This site colours the forecast line by speed of change — at the Typical sensitivity setting, under 2 hPa per 3 hours reads as calm, 2–4 hPa as shifting, and more than 4 hPa per 3 hours as a rapid swing — the kind many pressure-sensitive people say they feel most. The Sensitivity control above the chart moves these cutoffs: More sensitive flags smaller, slower changes sooner, while Less sensitive waits for bigger ones — so the colours can match how strongly you tend to feel the weather.
Does everyone feel pressure changes the same way?
No — sensitivity varies a lot. Some people react to drops, others to rises, and some mainly to the speed of change regardless of direction. Keeping an eye on the chart alongside your own symptom diary is the best way to learn your personal pattern.
Can I use this to manage a medical condition?
Please treat this site as a weather tool, not medical advice. It can help you anticipate conditions many people report as triggers, but decisions about treatment belong with you and your doctor. If your symptoms are new, changing, or severe, talk to a healthcare professional.
Why do I see numbers instead of a place name?
If you use the "My Location" button, the site shows the detected point as [latitude, longitude] rather than guessing at a nearby place name. The numbers are rounded to about 1 km before they're used or stored — precise enough for a pressure forecast, vague enough that a shared link doesn't point at your front door.
Can I bookmark my city?
Yes — once you pick a location, the address bar updates to a shareable link you can bookmark or text to a fellow weather-head. The site also remembers your last location on this device. On a phone, you can use your browser's "Add to Home Screen" to install it like an app.