Barometric Pressure in Portland, United States 
0000 hPa
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00.0 m/s
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The pressure in Portland, Maine, United States is predicted to drop over the next few hours, with an average pressure of 988.8 hPa today, which is lower than normal.
Weather prediction: Expect wet, unsettled weather and a strong breeze
The daily total fluctuation in pressure in Portland is 15.5 hPa, with a low of 981.1 hPa and a high of 996.6 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Portland hour by hour and stay informed about how it will change over the next 6 hours.
The barometric pressure in Portland, Maine fluctuates throughout the year. It can drop rapidly before a storm, causing windy and rainy conditions. Pressure rises when a high-pressure system moves in, bringing clear skies and fair weather.
Portland is situated on a peninsula, surrounded by water on two sides. The coastline and nearby lakes affect the air pressure. The city's proximity to the ocean means moisture-laden air moves in quickly. The surrounding hills and mountains also influence the airflow, leading to changes in pressure.
The landscape's impact on pressure is noticeable during winter months. Cold air from Canada moves down the Saint Lawrence River Valley, causing pressure to drop. As the air reaches the ocean, it cools, and the pressure rises. This pattern leads to frequent weather changes during the winter.