Barometric pressure in Hong Kong
Day to day, pressure has barely moved. From here it heads down until tomorrow afternoon.
Sea level reading, as of 23:00 local time.
The past week and the days ahead
The shaded part shows the days already gone. The thicker line is the forecast. The thin grey line is the average over a whole day, so you can see where pressure is heading under the daily up and down.
The week ahead
Each day at a glance: how far pressure moves, and the low and high it reaches.
Dips in the afternoon, and comes back by the end of the day.
32° / 28°8.1 mmlow 1000 · high 1002 hPa
The same daily dip.
31° / 28°3.3 mmlow 999 · high 1002 hPa
Edges up slowly through the day.
31° / 27°14.1 mmlow 1001 · high 1004 hPa
Edges up slowly through the day.
30° / 26°27.0 mmlow 1001 · high 1005 hPa
Eases down slowly through the day.
31° / 27°5.1 mmlow 1000 · high 1004 hPa
Dips in the afternoon, and comes back by the end of the day.
30° / 28°2.7 mmlow 999 · high 1002 hPa
Barely moves all day.
30° / 26°35.1 mmlow 1001 · high 1002 hPa
Hour by hour
| Hour | Weather and temperature | Rain (mm) | Pressure (hPa) |
|---|---|---|---|
| 00:00 | 29° | 0.1 | 1002 |
| 01:00 | 29° | 0.1 | 1002 |
| 02:00 | 29° | 0.1 | 1001 |
| 03:00 | 29° | 0.1 | 1001 |
| 04:00 | 28° | 0.1 | 1001 |
| 05:00 | 28° | 0.1 | 1001 |
| 06:00 | 29° | 0.2 | 1001 |
| 07:00 | 29° | 0.2 | 1002 |
| 08:00 | 30° | 0.2 | 1002 |
| 09:00 | 30° | 0.1 | 1002 |
| 10:00 | 31° | 0.1 | 1002 |
| 11:00 | 32° | 0.1 | 1002 |
| 12:00 | 32° | 1.6 | 1002 |
| 13:00 | 31° | 1.6 | 1002 |
| 14:00 | 30° | 1.6 | 1001 |
| 15:00 | 30° | 0.5 | 1001 |
| 16:00 | 31° | 0.5 | 1000 |
| 17:00 | 31° | 0.5 | 1000 |
| 18:00 | 30° | 0.1 | 1000 |
| 19:00 | 29° | 0.1 | 1001 |
| 20:00 | 29° | 0.1 | 1001 |
| 21:00 |  29° | 1002 | |
| 22:00 | 29° | 1002 | |
| 23:00 | 29° | 1002 |
A quiet week. Nothing moves more than 4 hPa in a day.
The lowest reading, about 999 hPa, comes tomorrow afternoon; it climbs from there.
Hong Kong has a strong daily rhythm: pressure swings about 3 hPa between a regular low and high, at almost the same hours each day. Most of what the graph shows is that daily wave, which is why the change since yesterday says more here than the change over a few hours.
Hong Kong is at sea level, so a barometer there reads about the same as the sea-level figure.
The hours already past are the model's record of each hour as it passed, anchored to real observations, though not a reading from an instrument in Hong Kong.
About Hong Kong
In Hong Kong the pressure gap between winter and summer is bigger than almost any single day's move. January averages about 1020 hPa and July about 1005, a seasonal drop of some 16 hPa. A sharp day-to-day change, meanwhile, is a rarity, appearing about once every other year. The exceptions are typhoons. When one approaches this stretch of China's southern coast, the pressure can fall well below its summer norm within a day or two. The rest of the time, the pressure stays steady for long stretches.
Sources: WikipediaERA5 reanalysisElevation: Copernicus DEM via Open-Meteo
Cities nearby
Open one to see its pressure, or search for your own city at the top of the page.
Curious what you are breathing? See the air quality in Hong Kong today, on our sister site 
airindex.today.
Common questions
What is a normal barometric pressure?
Near 1013 hPa at sea level; the exact standard figure, 1013.25 hPa, is the same as 760 mmHg, 29.92 inHg or 101.3 kPa. Anything between roughly 1000 and 1025 hPa is ordinary. Which way it is going matters far more than the number itself.
Why does my own barometer show a different number?
Usually altitude. Weather services correct readings to what they would be at sea level, so that cities can be compared. Hong Kong is at sea level, so there is almost nothing to correct and the two figures agree.
Is a millibar the same as a hectopascal?
Yes. One millibar and one hectopascal are exactly the same amount of pressure, so 1013 mbar and 1013 hPa mean the same thing. The name changed; the number did not.
Does falling pressure mean rain?
Not by itself. Away from the tropics, falling pressure usually means a low is approaching, and lows carry the fronts that bring cloud and rain, so the two often arrive together. But a shallow fall can pass with nothing more than cloud, and rain falls under steady pressure too. The graph tells you a system is on the way, not how wet it will be. The week ahead, just above, shows the rain forecast beside the pressure.
