Caernarfon pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in Caernarfon is low; cypress, grass, and mugwort are low. Tomorrow (10 August 2026) levels are similar - mugwort remains low. Over the following five days cypress, grass, and mugwort will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

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Residents in Caernarfon dealing with hay fever usually point to birch and oak as the culprits, particularly in spring near parks and gardens. Grass pollen from surrounding Gwynedd fields is significant through the summer months, carried in by easterly winds. This mix of urban and rural influence gives Caernarfon a fairly typical pollen pattern for the wider region.

Today - 9 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    Low

    5/100

  • Grass (Poaceae):

    Low

    6/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    22/100

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 - 10 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    8/100

Air quality in Caernarfon

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Frequently Asked Questions

Is pollen high in Caernarfon right now?

On 9 August 2026, overall pollen levels in Caernarfon are low. Cypress is the main contributor to airborne pollen, while grass and artemisia remain at lower levels

Will pollen levels change in Caernarfon tomorrow?

On 10 August 2026, pollen conditions in Caernarfon will be different from today, with artemisia at low levels

Is pollen expected to decrease in Caernarfon this week?

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

Which pollen types are currently active in Caernarfon?

On 9 August 2026, Cypress is the dominant pollen source in Caernarfon. grass and artemisia are also present but at lower levels. willow and hazel are not currently active.

When is pollen season in Caernarfon?
Pollen season in Caernarfon really gets going with birch, followed not long after by oak. Birch tends to release pollen between March and May, then oak carries on from April until May. Grass season overlaps a lot of this too, running May through September and peaking mid-summer. Not a bad idea to stock up on antihistamines before it all kicks off.
How often is the Caernarfon pollen forecast updated?

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

Does pollen in Caernarfon 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 Caernarfon 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 Caernarfon, 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: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Caernarfon.

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Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.