Barometric Pressure in Portland, United States

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The pressure in Portland, Oregon, United States is predicted falling over the next 24 hours, with an average pressure of

1007.8

today, which is lower than normal.

Weather prediction: Rain at times, very unsettled

The daily total fluctuation in pressure in Portland is

3.5

, with a low of

1006

and a high of

1009.5

.

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Forecast

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.