Thunderstorm asthma alert
Published on 21 October 2025
Alert for 21-22 October 2025
During grass pollen season people may notice an increase in asthma and hay fever. Grass pollen season (October through to December) also brings the chance of thunderstorm asthma.
Thunderstorm asthma is thought to be triggered by a unique combination of high amounts of grass pollen in the air and a certain type of thunderstorm. For people who have asthma or hay fever this can trigger severe asthma symptoms.
If you have current, past or undiagnosed asthma or seasonal hay fever you are at increased risk of thunderstorm asthma. So be prepared to manage any symptoms and stay out of hospital.
You can protect yourself and those in your care by following these simple steps:
- Don’t be outdoors in a storm, especially during the winds that precede them.
- Take your preventative medication as directed, even when you’re symptom free.
- Carry your reliever and know how to manage an asthma attack.
- Follow your asthma action plan or use the 4 steps of asthma first aid.
The symptoms of asthma, hay fever and COVID-19 can be similar, and it can be difficult to tell the difference between them. If you are
The thunderstorm asthma risk forecast, as well as up to date grass pollen count and grass pollen forecast information is available on the Melbourne Pollen Count and Forecast website.
To view thunderstorm asthma resources, including posters, brochures and fact sheets in other languages, visit the Thunderstorm asthma – multicultural resources page.
More information
Epidemic thunderstorm asthma risk forecast | health.vic.gov.au
Thunderstorm asthma | Better Health Channel