Barometric pressure in London
Air pressure rose slowly over the last 24 hours. It stands 2 hPa higher than it did at this time yesterday. The rise is coming to an end: from here it falls until early on Saturday.
Sea level reading, as of 15:00 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.
24° / 13°low 1023 · high 1026 hPa
Falls quickly through the day.
22° / 13°low 1015 · high 1024 hPa
Falls steadily through the day.
22° / 16°low 1010 · high 1015 hPa
Barely moves all day.
27° / 17°1.8 mmlow 1010 · high 1011 hPa
Falls steadily through the day.
24° / 17°9.3 mmlow 1005 · high 1010 hPa
Eases down slowly through the day.
22° / 14°2.1 mmlow 1003 · high 1005 hPa
Rises steadily through the day.
22° / 16°2.0 mmlow 1003 · high 1008 hPa
Hour by hour
| Hour | Weather and temperature | Rain (mm) | Pressure (hPa) |
|---|---|---|---|
| 00:00 | 16° | 1025 | |
| 01:00 | 15° | 1025 | |
| 02:00 | 14° | 1025 | |
| 03:00 | 14° | 1025 | |
| 04:00 | 14° | 1025 | |
| 05:00 | 13° | 1026 | |
| 06:00 | 13° | 1026 | |
| 07:00 | 13° | 1026 | |
| 08:00 | 15° | 1026 | |
| 09:00 |  17° | 1026 | |
| 10:00 | 18° | 1026 | |
| 11:00 | 20° | 1026 | |
| 12:00 | 21° | 1026 | |
| 13:00 | 23° | 1025 | |
| 14:00 | 23° | 1025 | |
| 15:00 | 24° | 1024 | |
| 16:00 | 24° | 1024 | |
| 17:00 | 24° | 1023 | |
| 18:00 | 24° | 1023 | |
| 19:00 | 23° | 1023 | |
| 20:00 | 22° | 1023 | |
| 21:00 |  20° | 1024 | |
| 22:00 | 18° | 1024 | |
| 23:00 | 17° | 1024 |
Monday has the week's biggest move: down 9 hPa.
The low point comes early on Saturday, near 1003 hPa; after that it rises.
London sits 29 m above sea level, so a barometer in the city reads about 3 hPa lower than the sea-level figure. A home station set to the local reading should show about 1021 hPa as of 15:00.
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 London.
About London
London's pressure covers a wide range in the course of a year. Settled, high-pressure spells are frequent; the pressure sits above 1020 hPa on about 129 days annually. Yet the city also spends nearly a month of days below 1000 hPa, mostly in autumn and winter. It moves between those levels quickly too. Sharp changes come about 71 times a year, and a few come even in midsummer. The pressure averages highest in February and lowest in November, only about 6 hPa apart. The weather often covers that gap in a single day.
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 London, 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 London, which stands 29 m above sea level, is in the note above: about 3 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.
