Barometric pressure in Rui’an
Taking each day as a whole, pressure has been rising steadily. It is 3 hPa higher than this time yesterday. The rise carries on until tomorrow morning.
Sea level reading, as of 00:00 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.
Edges up slowly through the day.
29° / 27°24.6 mmlow 1005 · high 1007 hPa
Barely moves all day.
28° / 25°23.4 mmlow 1006 · high 1008 hPa
Falls quickly through the day.
32° / 25°0.9 mmlow 1001 · high 1007 hPa
Falls first, then climbs in the evening.
29° / 26°51.9 mmlow 996 · high 1002 hPa
Edges up slowly through the day.
29° / 27°9.6 mmlow 1001 · high 1004 hPa
Barely moves all day.
30° / 27°0.6 mmlow 1003 · high 1006 hPa
Still barely moving.
30° / 28°0.9 mmlow 1003 · high 1005 hPa
Hour by hour
| Hour | Weather and temperature | Rain (mm) | Pressure (hPa) |
|---|---|---|---|
| 00:00 | 27° | 1.3 | 1006 |
| 01:00 | 27° | 1.3 | 1005 |
| 02:00 | 27° | 1.3 | 1005 |
| 03:00 | 27° | 1.0 | 1005 |
| 04:00 | 27° | 1.0 | 1005 |
| 05:00 | 27° | 1.0 | 1005 |
| 06:00 | 28° | 1.2 | 1005 |
| 07:00 | 28° | 1.2 | 1006 |
| 08:00 | 28° | 1.2 | 1006 |
| 09:00 | 28° | 1.2 | 1006 |
| 10:00 | 29° | 1.2 | 1007 |
| 11:00 | 29° | 1.2 | 1007 |
| 12:00 | 29° | 1.0 | 1006 |
| 13:00 | 29° | 1.0 | 1006 |
| 14:00 | 29° | 1.0 | 1005 |
| 15:00 | 28° | 1.3 | 1005 |
| 16:00 | 27° | 1.3 | 1005 |
| 17:00 | 27° | 1.3 | 1005 |
| 18:00 | 27° | 0.4 | 1005 |
| 19:00 | 28° | 0.4 | 1006 |
| 20:00 | 28° | 0.4 | 1006 |
| 21:00 | 28° | 0.8 | 1007 |
| 22:00 | 27° | 0.8 | 1007 |
| 23:00 | 27° | 0.8 | 1007 |
Biggest change: Wednesday, down 7 hPa.
Pressure tops out near 1008 hPa tomorrow morning, and falls after that.
Rui’an has a strong daily rhythm: pressure swings about 2 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.
Rui’an 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 Rui’an.
Cities nearby
Open one to see its pressure, or search for your own city at the top of the page.
Is this weather normal for the season? See how these days compare with Rui’an weather since 1940, on our sister site 
weatherjourney.com.
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. Rui’an 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.
