Cardiff pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Cardiff is high; cypress and eucalyptus are high; acacia and grass are moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) acacia remains moderate, cypress remains high, eucalyptus remains high, grass declining.
7-Day Trend
Over the next week eucalyptus and grass will increase; acacia and cypress will decrease.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Moderate | 49/100 |
| Cypress (Cupressaceae) | High | 64/100 |
| Eucalyptus (Myrtaceae) | High | 64/100 |
| Grass (Poaceae) | Moderate | 29/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | Moderate | 37/100 | |
| Cypress (Cupressaceae) | High | 52/100 | |
| Eucalyptus (Myrtaceae) | High | 51/100 | |
| Grass (Poaceae) | Low | 17/100 |
Local Environmental Conditions
Here, within the local area, water here is bordered by river oak, a casuarina species known for prolific, far-carrying pollen. Located just around the area, this area has eucalypt dominating the treeline with wattle scattered through it, both contributing to the season's pollen load. Comparable land cover in surrounding areas tends to produce a similar pollen mix overall.
Along the waterway, river oak releases pollen first, topping out well before most other trees start releasing pollen, around July and August. By late winter, eucalypt and wattle in the woods take over, typically the year's sharpest tree-pollen spell, centered on wattle's flowering in August and September. Grass pollen rises through spring toward a November high point, with the season extending well into summer before finally winding down in February.
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Frequently Asked Questions About Pollen in Western Australia
Is pollen high in Cardiff right now?
On 20 September 2026, overall pollen levels in Cardiff are high. Myrtle is the main contributor to airborne pollen, while cypress, grass, and acacia remain at lower levels
Will pollen levels change in Cardiff tomorrow?
On 21 September 2026, pollen conditions in Cardiff will be different from today, with myrtle at high levels, acacia at moderate levels, cypress at high levels and grass continuing to decline
Is pollen expected to decrease in Cardiff this week?
According to the five-day outlook, acacia and cypress pollen levels are expected to gradually decrease, while myrtle and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Cardiff?
On 20 September 2026, Myrtle is the dominant pollen source in Cardiff. cypress, grass, and acacia are also present but at lower levels.
When is pollen season in Cardiff?
How often is the Cardiff pollen forecast updated?
The Cardiff pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Cardiff 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 Cardiff 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 Cardiff, 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).
