Barometric Pressure in Portland, United States 
1024.7 hPa
18.2 ℃
39%
2.02 m/s
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The average pressure in Portland, Maine, United States today is , which is higher than normal. Pressure is trending rising.
Weather prediction: Fairly fine, possible showers early
Rapid Pressure Changes
Rapid pressure changes detected in Portland, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Fall : ()
- Rapid Rise : ()
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, 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.