Live · KCMH · reported 18 min ago
Barometric pressure today
Live air pressure from the weather station nearest you, with the trend and a 24-hour graph.
Nearest station to Columbus, OH
29.93inHg
1013.6 hPa (mb)
- 3-hour change
- −0.07 inHg · −2.4 hPa
- 24-hour range
- 29.93 – 30.15 inHg
- Station (absolute) pressure
- 29.11 inHg
- Barometer dial reads
- Change · near normal
Reading the number
Is today’s pressure high or low?
Standard sea-level pressure is 29.92 inHg (1013.25 hPa). Today’s reading is near normal. The trend over the last three hours tells you where the weather is heading.
- Very low Stormy < 29.50
- Low Clouds, rain 29.50–29.80
- Normal Changeable 29.80–30.20
- High Fair 30.20–30.50
- Very high Dry, clear > 30.50
Sea-level values, inHg · hPa. Rules of thumb for mid-latitudes. What counts as normal pressure
Live by city
The station board
Every reading on this site comes from an airport weather station, so here it is the way airports show things. Pick a city for its live reading, 24-hour barograph and how its elevation changes what a barometer reads there.
| City | Station | inHg | 3 h |
|---|---|---|---|
| New York, NY | KJFK | 29.79 | ↘ -1.7 |
| Los Angeles, CA | KLAX | 30.02 | ↘ -1.3 |
| Chicago, IL | KORD | 29.92 | ↘ -1.3 |
| Denver, CO | KDEN | 30.14 | ↘ -3.4 |
| Houston, TX | KIAH | 30.15 | ↘ -1.7 |
| Miami, FL | KMIA | 29.94 | ↘ -0.6 |
| Seattle, WA | KSEA | 30.14 | ↗ +0.6 |
| Phoenix, AZ | KPHX | 30.05 | ↘ -2.0 |
| London, United Kingdom | EGLL | 30.12 | ↘ -1.0 |
| Paris, France | LFPO | 30.15 | ↘ -1.0 |
| Tokyo, Japan | RJTT | 30.30 | ↘ -1.0 |
| Sydney, Australia | YSSY | 30.15 | ↗ +1.0 |
| Mexico City, Mexico | MMMX | 30.19 | ↘ -3.8 |
| Toronto, Canada | CYTZ | 29.71 | ↘ -1.7 |
Rising or falling
The 3-hour trend, in forecasters’ words
Weather services describe the change over three hours with a fixed vocabulary. The badge under the reading uses the same words.
- Steady < 0.1 hPa
Weather holds as it is.
- Slowly 0.1 – 1.5 hPa
A gradual change; check again later.
- Rising / falling 1.6 – 3.5 hPa
A front or system is on the move.
- Quickly 3.6 – 6.0 hPa
Wind and rain (or clearing) soon.
- Very rapidly > 6.0 hPa
Storm or gale close by.
Free tools
Pressure and altitude tools
Guides
Understand the barometer
Basics What Is Barometric Pressure? A Plain-English Guide
Barometric pressure is the weight of the air above you. Here is what the number means, the units it comes in, what is normal and why it changes with the weather.
Basics What Is Air Pressure? Atmospheric Pressure Explained
Air pressure is the weight of the air pressing on everything around you. Here is what causes it, how it is measured, its value at sea level and why it changes.
Basics What Is Normal Barometric Pressure?
Normal sea-level pressure is 29.92 inHg (1013.25 hPa). Here are the ranges for high, low and extreme readings, and why the normal at your elevation is lower.
Weather High vs Low Pressure: What Each Means for the Weather
High pressure usually brings clear, calm weather; low pressure brings clouds, wind and rain. Here is why, with the numbers that separate them and how to tell which one you are in today.
How-to How to Read a Barometer (and Forecast the Weather)
How to read a dial barometer or barometer app, set it correctly for your elevation and use the rising or falling trend to forecast the next 12–24 hours.
Frequently asked questions
What is the barometric pressure today?
The reading at the top of this page is the latest sea-level barometric pressure from the weather station nearest to you, updated about every 10 minutes. Standard sea-level pressure is 29.92 inHg (1013.25 hPa); most days fall between 29.60 and 30.30 inHg.
What is the air pressure today?
Air pressure, atmospheric pressure and barometric pressure are the same thing. The live reading at the top of this page is today’s air pressure at the weather station nearest you, corrected to sea level like every weather report. What air pressure is.
Is the barometric pressure high or low today?
Compare the reading with 29.92 inHg (1013 hPa). Above about 30.20 inHg (1023 hPa) is high pressure, usually with settled, clear weather. Below about 29.80 inHg (1009 hPa) is low pressure, often with clouds, wind and rain. The trend matters as much as the number: see the 3-hour change under the reading.
Where does this barometric pressure reading come from?
From official airport weather stations (METAR reports) published by the NOAA Aviation Weather Center. The value is the altimeter setting: the station pressure corrected to sea level, the same figure weather apps and TV forecasts call "pressure". More about the data.
Why does my phone or home barometer show a different number?
A barometer sensor measures absolute pressure where it is, which drops about 1 inHg for every 1,000 ft (300 m) you climb. Weather reports correct that to sea level so places can be compared. The "station (absolute) pressure" figure above shows roughly what an uncorrected sensor reads at your station.
What does a falling barometer mean?
Pressure falling 1.6–3.5 hPa (0.05–0.10 inHg) in three hours usually means a low-pressure system or front is approaching, with a growing chance of wind and rain. A fall of more than 6 hPa in three hours signals a strong storm. Rising pressure points to clearing, more settled weather.
How often is the pressure updated?
Most stations report every hour, and more often when the weather changes quickly. The page checks for a new report every 10 minutes while it is open.