Rhyl pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Rhyl is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing.
7-Day Trend
Over the next week mugwort will decrease; cypress, grass, and willow will remain stable.
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Features and forecast availability vary by region.
Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| 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 | 19/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| 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) | High | 52/100 |
Local Environmental Conditions
In Rhyl, alder and oak dominate the local tree pollen picture, with parks and tree-lined residential streets offering more exposure than the compact centre. Local farmland and hedgerows nearby add meaningful grass pollen through late spring and summer, especially under the dominant maritime airflow. Seasonal peaks tend to track the wider regional pattern, tree pollen leading in spring and grass through summer.
For Rhyl, the season kicks off with birch and then hands things over to oak. Birch tends to release pollen between March and May, with oak picking up between April and May. On top of that, grass pollen runs May to September and tends to hit hardest in June and July. Not a bad idea to stock up on antihistamines before it all kicks off.
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Frequently Asked Questions About Pollen in Denbighshire
Is pollen high in Rhyl right now?
On 20 September 2026, overall pollen levels in Rhyl are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Rhyl tomorrow?
On 21 September 2026, pollen conditions in Rhyl will be different from today, with artemisia increasing
Is pollen expected to decrease in Rhyl this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Rhyl?
On 20 September 2026, Artemisia is the dominant pollen source in Rhyl. cypress, grass, and willow are not currently active.
When is pollen season in Rhyl?
How often is the Rhyl pollen forecast updated?
The Rhyl pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Rhyl 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 Rhyl 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 Rhyl, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
