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Barometric Pressure in Saint Helena, Ascension and Tristan da Cunha

We monitor barometric pressure across 1 city in Saint Helena, Ascension and Tristan da Cunha, giving you up-to-date insights into local weather patterns.

Flag of Saint Helena, Ascension and Tristan da Cunha

Whether you're tracking pressure changes for health reasons, planning outdoor activities, or planning a fishing trip, our data is tailored to conditions in Saint Helena, Ascension and Tristan da Cunha, with detailed readings city by city.

Saint Helena, Ascension and Tristan da Cunha Barometric Pressure Map

Depending on how many places we monitor in Saint Helena, Ascension and Tristan da Cunha, the map displays a sampled set of barometric pressure data to give a clear overview of current conditions.

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

Saint Helena, Ascension, and Tristan da Cunha are affected by large weather systems like the South Atlantic High. This is a high-pressure system that usually keeps the weather steady and calm. Sometimes, passing low-pressure systems can bring clouds, wind, or a bit of rain.

Geography

Geography changes the way air pressure spreads across these islands. Saint Helena and Ascension are small and surrounded by ocean, so the sea helps keep their air pressure steady without big swings. Tristan da Cunha is further south and closer to stormy weather, so it sometimes feels lower pressures.

Seasonal Cycles

During the year, pressure goes through gentle changes. Over summer, high pressure is usually stronger, which brings drier and more settled weather. In winter, the high weakens a bit, and low-pressure systems pass by more often, so wet and windy weather can happen.

Climate Change

Because of climate change, the South Atlantic High has become stronger and shifted slightly. This means the islands might get longer dry spells and warmer temperatures. Weather patterns could become less predictable, making long-term pressure trends harder to guess.

Places in Saint Helena, Ascension and Tristan da Cunha

You can find your city in the lists below, by using our search, or on the Saint Helena, Ascension and Tristan da Cunha Pressure Map above. We're tracking barometric pressure across multiple locations in Saint Helena, Ascension and Tristan da Cunha 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.

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