Winterthur pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Winterthur is medium; grass is medium. Tomorrow (26 June 2026) levels are similar - grass remains medium, cypress at low levels. Over the following five days cypress and grass will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

For long term forecasts and maps, see the Airmine app

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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Winterthur's parks and the Eulach River corridor feature oak, birch, and linden as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Swiss Mittelland farmland and the Töss valley woodland contribute substantial tree and grass pollen, while the relatively sheltered setting between the Jura and the Pre-Alps channels airflows across the city.

Today - 25 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    43/100

  • Willow (Salicaceae):

    None

    0/100

High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.

Tomorrow - 26 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    Low

    5/100

  • Grass (Poaceae):

    Medium

    49/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Winterthur right now?

On 25 June 2026, overall pollen levels in Winterthur are moderate. Grass is the main contributor to airborne pollen

Will pollen levels change in Winterthur tomorrow?

On 26 June 2026, pollen conditions in Winterthur will be different from today, with grass at medium levels, cypress at low levels

Is pollen expected to decrease in Winterthur this week?

According to the five-day outlook, grass and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

Which pollen types are currently active in Winterthur?

On 25 June 2026, Grass is the dominant pollen source in Winterthur. willow, alder, birch, hazel, and cypress are not currently active.

When is pollen season in Winterthur?
Winterthur's pollen season runs from January through August, opening with hazel and alder from January before birch peaks through April. Oak and ash follow through April and May, with grass peaking through June and July. The Eulach and Töss valleys channel airflows, while surrounding Swiss Mittelland farmland contributes substantial grass pollen. The relatively sheltered setting between the Jura and Pre-Alps extends the season slightly compared to higher elevation Swiss cities.
How often is the Winterthur pollen forecast updated?

The Winterthur pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in Winterthur come from nearby or far away?

Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.

Are pollen levels in Winterthur based on measurements or forecasts?

Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.

Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Winterthur, modern forecasts combine recent measurements, weather data, and information about local vegetation.

This allows us to estimate pollen levels for today and the coming days, not just report the past.

Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.

Want to see pollen forecasts for other cities in Switzerland?

Basel Bern Biel/Bienne Geneva Lausanne Lucerne Lugano Sankt Gallen Zürich

Check pollen in other popular cities:

Sydney Rio de Janeiro Copenhagen Paris Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

Data provided by Airmine — Last update: 25 Jun 2026, 09:01 CET (Data is updated four times daily.)

This page provides the latest public pollen forecast for Winterthur.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.