Barometric Pressure
Barometric Pressure in Ontario, United States 
1013 hPa
16.7 ℃
76%
2.82 m/s
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The average pressure in Ontario, California, United States today is , which is considered normal. Pressure is trending falling.
Weather prediction: Rain at frequent intervals
The daily total fluctuation in pressure in Ontario is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Ontario hour by hour across the next 6 hourly readings.
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.