Pollen forecast for Vienna, 3 August 2026
Ongoing heatwave and rising mugwort pollen levels!
The heatwave is set to continue, and towards the end of the week the likelihood of heat-induced thunderstorms in the afternoon and evening will increase significantly. People with pollen allergies should continue to expect grass pollen levels in the coming days, although these will only reach low to moderate levels. Mugwort pollen levels, on the other hand, will rise over the course of the week and, combined with fungal spores, may lead to high levels of exposure.
Caution during thunderstorms: Due to the specific conditions before and during thunderstorms, with increased lightning activity, pollen grains can burst open and release unusually large quantities of allergens. This can lead to sudden spikes in pollen levels and trigger the phenomenon known as thunderstorm asthma.
The grass pollen season has passed its peak and now generally results in only low pollen concentrations in the ambient air. In woodlands or along riverbanks, levels may still be higher.
Along paths and roadsides, additional pollen levels from sorrel, foxtail plants and plantain are to be expected.
Unlike grass pollen, mugwort pollen levels are rising rapidly before the peak of the season is reached in mid-August.
Ragweed is also growing and sprouting; it will be some time yet before it flowers, well into August. If you spot ragweed populations whilst out and about, you are welcome to report them via the ‘Ragweed Finder’ citizen science platform. Reports can be submitted either via the website ragweedfinder.at or via the app (for Android and iOS). The reports are checked by experts from the ‘Ragweed Finder’ team, plotted on the ragweed map and forwarded at regular intervals to the relevant authorities in the federal states. These authorities can then use the sightings to take further action.
In addition to the pollen types already mentioned, pollen from stinging nettles, hemp, carnations and cypress trees is also currently present in the pollen spectrum. However, these pose only a very low allergenic risk.
Responsible for the content
AZ Pollenresearch GmbH
im Auftrag des Vereins Österreichischer Polleninformationsdienst in Kooperation mit der GeoSphere Austria.
Dr. med. Markus Berger, Dr. rer. nat. Johannes M. Bouchal und Lukas Dirr, MSc.
Wetterdaten und Prognosen basierend auf synoptischen Daten:
GeoSphere Austria, Bundesanstalt für Geologie, Geophysik, Klimatologie und Meteorologie (ehemals ZAMG).
zum Team
