Barometric Pressure in Portland, United States 
1027.3 hPa
15.3 ℃
63%
2.93 m/s
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The average pressure in Portland, Oregon, United States today is , which is higher than normal. Pressure is trending rising.
Weather prediction: Fairly fine, possible showers early
The daily total fluctuation in pressure in Portland is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Portland hour by hour across the next 6 hourly readings.
The barometric pressure in Portland, Oregon is generally mild. It averages around 30.15 inches of mercury. This is slightly above the national average.
Portland is situated near the confluence of the Willamette and Columbia rivers. The city is surrounded by mountains to the east and west. The Pacific Ocean lies to the west.
The surrounding mountains and ocean have an impact on the atmospheric pressure. The mountains block some weather patterns from reaching the city. The ocean helps regulate temperature and humidity.
During the winter, a high-pressure system often sits over the Pacific Ocean. This brings dry air from the east, lowering the barometric pressure. In the summer, a low-pressure system develops over the land. This pulls moist air from the ocean, increasing the barometric pressure.