Barometric Pressure
Barometric Pressure in American Samoa
We monitor barometric pressure across 0 cities in American Samoa, giving you up-to-date insights into local weather patterns.
Whether you're tracking pressure changes for health reasons, planning outdoor activities, or planning a fishing trip, our data is tailored to conditions in American Samoa, with detailed readings city by city.
American Samoa Barometric Pressure Map
Depending on how many places we monitor in American Samoa, the map displays a sampled set of barometric pressure data to give a clear overview of current conditions.Trends Today
Here you can see which cities experienced the biggest and smallest changes in barometric pressure today. This helps highlight areas with the most stable or unstable weather patterns.
Most volatile
Least volatile
How is it calculated?
Our volatility “beta” number is generated by an algorithm that analyzes hourly barometric pressure changes. It looks at how much the pressure fluctuates from hour to hour. A beta of 0 means no change, perfectly stable pressure. The higher the decimal value, the more variation there has been throughout the day or over a longer period.
Weather Systems
American Samoa’s air pressure gets influenced mainly by the South Pacific Convergence Zone, a big band of clouds and storms that often sits nearby. Moving weather systems, like tropical cyclones, can quickly change air pressure. High pressure means clearer skies, while low pressure brings clouds and rain.
Geography
The islands’ geography affects air pressure too. Tall islands force air to rise, making the pressure slightly lower around mountains. Flat coastal areas often have slightly higher pressure. Ocean all around helps keep the pressure more even compared to places surrounded by land.
Seasonal Cycles
During the wet season, from November to April, air pressure is usually lower because of frequent storms and warm waters. In the dry season, from May to October, pressure tends to be a bit higher, making dry weather more common. These patterns repeat every year.
Climate Change
Climate change is making pressure patterns less predictable. Warmer oceans can lead to lower air pressure and more intense storms. Over time, this might mean more frequent or stronger storms and changes in the timing of Samoa’s wet and dry seasons.
Places in American Samoa
You can find your city in the lists below, by using our search, or on the American Samoa Pressure Map above. We're tracking barometric pressure across multiple locations in American Samoa to keep you informed.
Each city includes a pressure status showing whether it's currently high, normal or low, along with two volatility values: one for today and one for the full period, usually 14 days. These help you see how much the pressure is changing over time.