Live · KSTL · reported 18 min ago
Barometric pressure in St. Louis, MO today
30.19inHg
1022.4 hPa (mb)
- 3-hour change
- −0.04 inHg · −1.4 hPa
- 24-hour range
- 30.18 – 30.28 inHg
- Station (absolute) pressure
- 29.69 inHg
- Barometer dial reads
- Change · slightly high
St. Louis at a glance
How elevation shapes the reading in St. Louis
St. Louis is about 466 ft (142 m) above sea level. That is close to sea level, so the pressure you stand in and the sea-level figure in the forecast are nearly the same.
The reading above is the altimeter setting from St Louis/Lambert Intl (KSTL), 21 km (13 mi) from the city center. It is the station’s measured pressure corrected to sea level, which is the number weather reports, apps and TV forecasts use, so you can compare St. Louis with any other city.
St. Louis elevation and what it means · Sea-level vs station pressure
| Elevation | 466 ft · 142 m |
|---|---|
| Weather station | St Louis/Lambert Intl (KSTL) |
| Station elevation | 535 ft · 163 m |
| Standard air pressure at this elevation | 29.42 inHg · 996 hPa |
| Air pressure vs sea level | 98% |
| Water boils at | 211.1 °F · 99.5 °C |
| Time zone | America/Chicago |
Reading the barometer
Is the pressure in St. Louis high or low?
Today’s reading is slightly high. Weather pressure is quoted at sea level, so the same scale works for St. Louis and everywhere else.
- 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
Frequently asked questions
What is the barometric pressure in St. Louis today?
The live reading at the top of this page is the latest sea-level pressure reported by St Louis/Lambert Intl (KSTL), 21 km (13 mi) from the city center. It updates about every 10 minutes; the graph shows the last 24 hours.
What is normal barometric pressure in St. Louis?
Weather reports for St. Louis use sea-level pressure, so “normal” is the same as anywhere: about 29.92 inHg (1013 hPa), with most days between 29.60 and 30.30 inHg (1002–1026 hPa). Readings above 30.20 inHg are high pressure; below 29.80 inHg is low pressure.
Why does a barometer in St. Louis read lower than the forecast?
St. Louis is close to sea level (about 466 ft), so absolute and sea-level pressure differ by only about 0.50 inHg (17 hPa). A larger gap usually means the barometer needs to be calibrated against the reading on this page.
Is the pressure in St. Louis rising or falling?
See the trend badge under the reading: it compares the latest report with the one three hours earlier. Falling pressure usually means clouds, wind or rain on the way; rising pressure means clearing and more settled weather.