Barometric Pressure in Portland, Maine, US

The pressure in Portland, United States is predicted to slowly rise over the next few hours, with an average pressure of 1022.7 hPa today, which is considered normal.

Weather prediction: Expect more fair, dry, cool weather

The daily total fluctuation in pressure in Portland is 2.7 hPa, with a low of 1021.1 hPa and a high of 1023.8 hPa. The daily average here is higher than in most cities around the world.

Forecast

• Low Pressure
• Normal Range
• High Pressure

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.

Disclaimer

* The barometric pressure information for Portland, Maine, United States on this page is for educational purposes only. We are not responsible for its accuracy or reliability. This information is not medical advice. Consult a health professional for medical concerns and do not rely on this site for medical decisions.