Barometric Pressure
Barometric Pressure in Ontario, United States 
0000 hPa
00.0 ℃
00.0 m/s
00.0%
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The pressure in Ontario, California, United States is predicted to slowly drop over the next few hours, with an average pressure of 976.9 hPa today, which is lower than normal.
Weather prediction: Expect more wet and unsettled conditions
The daily total fluctuation in pressure in Ontario is 2.1 hPa, with a low of 975.8 hPa and a high of 977.9 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Ontario hour by hour and stay informed about how it will change over the next 6 hours.
Ontario, California has a Mediterranean climate. This means dry summers and mild, wet winters. The San Bernardino Mountains east of Ontario block wet air from the Pacific Ocean, keeping summers dry. In summer, high air pressure builds, bringing hot, dry air. In winter, low air pressure moves in, bringing rain and cooler temperatures. Overall, Ontario's climate has a big effect on its air pressure, leading to these seasonal weather patterns.