Caernarfon pollen forecast - today, tomorrow and the week ahead
Today (16 July) pollen in Caernarfon is low; cypress and grass are low. Tomorrow (17 July 2026) levels are similar. 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
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
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 - 16 July
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
9/100
-
Grass (Poaceae):
Low
23/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
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 - 17 July
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
8/100
-
Grass (Poaceae):
Low
21/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
None
0/100
Air quality in Caernarfon
View air qualityFrequently Asked Questions
Is pollen high in Caernarfon right now?
On 16 July 2026, overall pollen levels in Caernarfon are low. Cypress is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Caernarfon tomorrow?
On 17 July 2026, pollen conditions in Caernarfon will be similar to today, with cypress at low levels, grass 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 16 July 2026, Cypress is the dominant pollen source in Caernarfon. grass are also present but at lower levels. birch, hazel, willow, alder, and artemisia are not currently active.
When is pollen season in Caernarfon?
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?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 16 July 2026 at 05:36 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Caernarfon.
For long term forecasts and maps, see the Airmine app
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.