Barometric pressure in Tokyo
Air pressure has barely moved since this time yesterday. From here it falls until early on Thursday.
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 week ahead
Each day at a glance: how far pressure moves, and the low and high it reaches.
Barely moves all day.
31° / 23°3.5 mmlow 1015 · high 1017 hPa
Eases down slowly through the day.
31° / 23°low 1012 · high 1016 hPa
Falls steadily through the day.
34° / 26°low 1009 · high 1013 hPa
Eases down slowly through the day.
34° / 26°4.5 mmlow 1006 · high 1010 hPa
Barely moves all day.
32° / 26°3.3 mmlow 1006 · high 1008 hPa
Rises steadily through the day.
29° / 23°3.9 mmlow 1007 · high 1011 hPa
Falls steadily through the day.
28° / 22°3.0 mmlow 1008 · high 1012 hPa
Hour by hour
| Hour | Weather and temperature | Rain (mm) | Pressure (hPa) |
|---|---|---|---|
| 00:00 | 23° | 0.5 | 1016 |
| 01:00 |  24° | 1016 | |
| 02:00 |  24° | 1016 | |
| 03:00 |  24° | 1016 | |
| 04:00 | 24° | 0.1 | 1016 |
| 05:00 | 24° | 0.1 | 1016 |
| 06:00 | 24° | 0.1 | 1016 |
| 07:00 | 25° | 1017 | |
| 08:00 | 26° | 1017 | |
| 09:00 | 28° | 1017 | |
| 10:00 | 29° | 0.1 | 1017 |
| 11:00 | 30° | 0.1 | 1016 |
| 12:00 | 30° | 0.1 | 1016 |
| 13:00 | 31° | 1015 | |
| 14:00 | 31° | 1015 | |
| 15:00 | 31° | 1015 | |
| 16:00 | 30° | 0.7 | 1015 |
| 17:00 | 28° | 0.7 | 1015 |
| 18:00 | 27° | 0.7 | 1016 |
| 19:00 | 26° | 0.1 | 1016 |
| 20:00 | 26° | 0.1 | 1016 |
| 21:00 | 26° | 0.1 | 1016 |
| 22:00 |  25° | 1016 | |
| 23:00 | 25° | 1016 |
Of the seven days, Friday moves most: up 4 hPa.
Pressure bottoms out near 1006 hPa early on Thursday, and rises after that.
Tokyo sits 43 m above sea level, so a barometer in the city reads about 5 hPa lower than the sea-level figure. A home station set to the local reading should show about 1011 hPa as of 23:00.
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 Tokyo.
About Tokyo
Tokyo's pressure calendar has a rhythm of its own. The pressure's yearly peak comes in October, averaging near 1018 hPa, not in midwinter. Its low point arrives with the August heat, near 1009. Most of the action comes when the seasons change; about a quarter of the year's 51 big daily moves come in early spring alone. Midsummer, apart from typhoons, is the calmest time. Deep lows below 1000 hPa are infrequent, about five days a year. The barometer here is less a storm alarm than a season marker, tracking the slow yearly slide from the October high to the August low and back.
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.
Out in the sun today? Check the UV level in Tokyo, on our sister site 
uvi.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, and sometimes the instrument itself. Weather services correct readings to what they would be at sea level, so that cities can be compared. The figure for Tokyo, which stands 43 m above sea level, is in the note above: about 5 hPa below the sea-level reading. If your barometer is already set to sea level and still reads slightly differently, that is the setting on the instrument rather than the weather.
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.
