Perth Mold Forecast - Today, Tomorrow and the Week Ahead
Mold Today
Today (6 October) mold in Perth is moderate; cladosporium is moderate; alternaria is low.
Mold Tomorrow
Tomorrow (7 October 2026) alternaria remains low, cladosporium declining.
7-Day Trend
Over the next week alternaria and cladosporium will increase.
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Mold Risk
Today - 6 October
| Mold species | Level | Value |
|---|---|---|
| Alternaria | Low | 11/100 |
| Cladosporium | Moderate | 33/100 |
Tomorrow - 7 October
| Mold species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alternaria | Low | 6/100 | Steady |
| Cladosporium | Low | 23/100 | Increasing |
Local Mold Conditions
Mold has relatively little natural material to grow on around the heart of Perth, outside the green spaces among the buildings. Among the buildings, gardens, parks and street trees supply compost, mulch and fallen leaves in smaller pockets. Along the water's edge, washed-up weed and plant debris add a little more organic material.
Through most of the year, Cladosporium, the most common outdoor mold, is active on this plant material, with counts topping out in July at about 16°C. Warmer weather favors Alternaria, which is present through most of the year and peaks in March. Counts are lowest around December, when temperatures average about 22°C. Daily levels tend to climb through dry, windy afternoons and drop during prolonged rain.
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Resource Hub
Sports venues in Perth 1 sports venue
Local parkruns 43 parkruns
Frequently Asked Questions About Mold in Western Australia
Why do I still have allergy symptoms after the pollen season?
Allergy symptoms after the main pollen season may be caused by mold spores. Outdoor mold levels can remain high into late summer and autumn, when pollen levels are already falling. Mold allergy can cause symptoms similar to pollen allergy, including sneezing, a runny or blocked nose, itchy eyes, coughing, and wheezing.
What are mold spores and why do they cause allergies?
Mold spores are tiny particles released by fungi into the air. When inhaled, they can trigger an allergic reaction in sensitive people. Common symptoms include sneezing, a runny or blocked nose, itchy or watery eyes, coughing, and wheezing.
When are mold spore levels highest?
Outdoor mold spore levels often increase during warm and humid conditions, particularly when there is plenty of decaying vegetation. Levels can vary considerably with weather, season, vegetation, and location, and some types of mold are more common during particular times of the year, e.g. in the Fall.
How can I reduce my exposure to mold spores?
If you are sensitive to mold, check local mold spore levels and forecasts before spending long periods outdoors. On high-risk days, reducing time around dense vegetation, compost, fallen leaves, and other sources of decaying plant material may help limit exposure.
Understanding the Scale
The 0–100 mold scores represent risk levels, not direct mold measurements. Higher scores indicate higher risk.
Mold
| 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. |
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