Forecast

The birch has finished flowering in the valleys, but it continues to bloom on the mountains and is causing allergenic burden!

Sunny and dry weather throughout Vorarlberg at the start of the week. From Tuesday afternoon, however, the situation splits: while it remains friendly in the north, rain sets in in the south. The weather will stabilise again from Thursday. For pollen allergy sufferers, this means: during the sunny phases, the load is usually moderate to high, while rain provides temporary relief.

Birch pollen is still the most important allergen in the air. At lower altitudes, most birch trees have already finished flowering. In higher regions, birch trees are still releasing pollen. If the wind direction is right, pollen can be transported in allergy-relevant quantities to the valleys, where it can affect allergy sufferers. The hornbeam on the other hand, has almost completely faded.

Currently flowering in Vorarlberg walnut trees, oaks and beeches. As they are related to the birch family, they can trigger similar allergic reactions in sensitive people.

The manna ash is also in bloom. Although it is relevant for people allergic to ash pollen, it produces significantly less pollen than the common ash, as it is mainly pollinated by insects. Nevertheless, sensitive people should avoid direct contact.

The lilac is also in bloom. As a relative of the ash tree, it can also trigger cross-reactions. As it is mainly pollinated by insects, the pollen load is usually low and particularly noticeable in the immediate vicinity. Anyone who is sensitive to olive trees should therefore avoid placing flowering branches indoors.

The plane tree has reached the peak of its flowering period, but can continue to cause pollution along avenues. At the same time, the horse chestnuts are in bloom. They are particularly relevant for people who react to maple pollen.

At lower altitudes, the number of early-flowering grasses is slowly increasing. The first panicle, tufted and foxtail grasses have already been observed, meaning that a low to moderate level of exposure can be expected locally. At higher altitudes, however, the grasses will only start to flower later.

Oilseed rape is also currently flowering in the fields. Pollen levels can be significantly higher near these fields, which is why sensitive people should avoid these areas if possible.

In addition to the pollen types already mentioned, pollen from maple, larchspruce, rushes and cypress plants are present in the air. However, these only have a low allergenic potential.

Forecast from 2026-04-27

Note: The data shown here are model data for the expected start of flowering. For more detailed information on the expected pollen count, please refer to the text forecasts.