Caerdydd pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Caerdydd is high; grass is high; cypress is low. Tomorrow (26 June 2026) levels are similar - grass declining. Over the following five days cypress and grass will increase. 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

Caerdydd (Cardiff) has a mix of urban trees and grass, with allergenic species found in parks such as Bute Park and along streets. Within the city, pollen varies between large green spaces and river corridors versus more built-up areas where vegetation is limited. Surrounding areas have more continuous vegetation, leading to higher and more widespread pollen levels than in the urban core.

Today - 25 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    Low

    11/100

  • Grass (Poaceae):

    High

    56/100

  • 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):

    Low

    25/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Caerdydd right now?

On 25 June 2026, overall pollen levels in Caerdydd are high. Grass is the main contributor to airborne pollen, while cypress remain at lower levels

Will pollen levels change in Caerdydd tomorrow?

On 26 June 2026, pollen conditions in Caerdydd will be different from today, with grass continuing to decline

Is pollen expected to decrease in Caerdydd this week?

According to the five-day outlook, cypress and grass pollen levels will increase later in the week.

Which pollen types are currently active in Caerdydd?

On 25 June 2026, Grass is the dominant pollen source in Caerdydd. cypress are also present but at lower levels. alder, birch, hazel, and willow are not currently active.

When is pollen season in Caerdydd?
Caerdydd (Cardiff) benefits from a mild coastal climate that advances the pollen season, with hazel and alder flowering from January in warm years. Oak and ash follow through April and May, prominent in parks such as Bute Park and along the Taff valley corridor. Grass pollen peaks through June and July, with surrounding Vale of Glamorgan farmland contributing additional exposure. Atlantic weather systems bring frequent rainfall that periodically interrupts the season throughout summer.
How often is the Caerdydd pollen forecast updated?

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

Does pollen in Caerdydd 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 Caerdydd 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 Caerdydd, 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 United Kingdom?

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Check pollen in other popular cities:

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Data provided by Airmine — Last update: 25 Jun 2026, 09:00 CET (Data is updated four times daily.)

This page provides the latest public pollen forecast for Caerdydd.

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.