Colwyn Bay pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Colwyn Bay is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing, grass at low levels.
7-Day Trend
Over the next week grass and mugwort will decrease; cypress and willow will remain stable.
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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 | 22/100 |
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) | Low | 16/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | High | 56/100 |
Local Environmental Conditions
Colwyn Bay sees alder and oak as the leading tree pollen contributors, with levels differing noticeably between well-vegetated suburbs and the denser core. The nearby the river meadows adds further grass and tree pollen exposure, particularly under moist Atlantic fronts. It's a pattern shared by plenty of similarly sized towns nearby, shaped more by geography than anything unusual locally.
Colwyn Bay's pollen year has two main tree culprits: birch first, oak close behind. Grass season overlaps a lot of this too, running May through September and peaking mid-summer. Birch gets going around March and tapers off by May, while oak follows on from April to May. Something to plan around if pollen usually gets to you.
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Frequently Asked Questions About Pollen in Conwy
Is pollen high in Colwyn Bay right now?
On 20 September 2026, overall pollen levels in Colwyn Bay are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Colwyn Bay tomorrow?
On 21 September 2026, pollen conditions in Colwyn Bay will be different from today, with grass at low levels and artemisia increasing
Is pollen expected to decrease in Colwyn Bay this week?
According to the five-day outlook, artemisia and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Colwyn Bay?
On 20 September 2026, Artemisia is the dominant pollen source in Colwyn Bay. cypress, grass, and willow are not currently active.
When is pollen season in Colwyn Bay?
How often is the Colwyn Bay pollen forecast updated?
The Colwyn Bay pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Colwyn Bay 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 Colwyn Bay 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 Colwyn Bay, 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).
