Glen Forrest pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Glen Forrest is moderate; acacia, cypress, and eucalyptus are moderate; grass is low.
Pollen Tomorrow
Tomorrow (21 September 2026) acacia remains moderate, eucalyptus remains moderate, grass remains low, cypress increasing.
7-Day Trend
Over the next week acacia, cypress, eucalyptus, and grass will decrease.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Moderate | 27/100 |
| Cypress (Cupressaceae) | Moderate | 50/100 |
| Eucalyptus (Myrtaceae) | Moderate | 31/100 |
| Grass (Poaceae) | Low | 6/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | Moderate | 32/100 | |
| Cypress (Cupressaceae) | High | 54/100 | |
| Eucalyptus (Myrtaceae) | Moderate | 37/100 | |
| Grass (Poaceae) | Low | 11/100 |
Local Environmental Conditions
Here, just outside the immediate area, the waterway's edge supports river oak, a species whose fine pollen travels well beyond the immediate bank. Here, in the wider area, eucalypt dominating the treeline with wattle scattered through it, both contributing to the season's pollen load. Here, within the local area, a park whose lawns and ornamental plane trees quietly add to local pollen levels.
River oak along the water gets the season underway before other species, starting well before the main spring rush, topping out around September. Eucalypt and wattle in the woods pick up where river oak leaves off, typically landing in August and September. Grass pollen counts rise through spring, reaching their peak around November, before staying elevated through the summer months into late January.
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Frequently Asked Questions About Pollen in Western Australia
Is pollen high in Glen Forrest right now?
On 20 September 2026, overall pollen levels in Glen Forrest are moderate. Myrtle is the main contributor to airborne pollen, while acacia, cypress, and grass remain at lower levels
Will pollen levels change in Glen Forrest tomorrow?
On 21 September 2026, pollen conditions in Glen Forrest will be different from today, with myrtle at moderate levels, grass at low levels, acacia at moderate levels and cypress increasing
Is pollen expected to decrease in Glen Forrest this week?
According to the five-day outlook, myrtle, grass, acacia, and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Glen Forrest?
On 20 September 2026, Myrtle is the dominant pollen source in Glen Forrest. acacia, cypress, and grass are also present but at lower levels.
When is pollen season in Glen Forrest?
How often is the Glen Forrest pollen forecast updated?
The Glen Forrest pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Glen Forrest 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 Glen Forrest 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 Glen Forrest, 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).
