Seixal pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Seixal is low; grass is low. Tomorrow (26 June 2026) levels are similar - grass increasing. Over the following five days 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

Seixal's suburban setting on the Tagus estuary features oak, pine, and eucalyptus as the main tree pollen sources in parks and along streets, with exposure varying between green areas and the more built-up areas. Surrounding Portuguese woodland and farmland contribute substantial tree and grass pollen, while the Atlantic-facing position and the Tagus estuary means onshore winds can periodically disperse pollen across the area.

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):

    Low

    25/100

  • 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):

    None

    0/100

  • Grass (Poaceae):

    Medium

    36/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Seixal right now?

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

Will pollen levels change in Seixal tomorrow?

On 26 June 2026, pollen conditions in Seixal will be different from today, with grass increasing

Is pollen expected to decrease in Seixal this week?

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

Which pollen types are currently active in Seixal?

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

When is pollen season in Seixal?
Seixal's pollen season runs from January through June, opening with pine and oak tree pollen in late winter before grass pollen from surrounding Portuguese farmland and eucalyptus woodland peaks through April and May. The Atlantic-facing position and the Tagus estuary mean onshore winds can periodically disperse pollen, while the proximity to Lisbon connects the area to the broader metropolitan pollen landscape throughout the spring season.
How often is the Seixal pollen forecast updated?

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

Does pollen in Seixal 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 Seixal 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 Seixal, 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 Portugal?

Almada Braga Cascais Lisbon Loures Matosinhos Porto Sintra Vila Nova de Gaia

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 Seixal.

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.