Perth: HeatWatch projects up to 55 days over 35°C per year by 2090


The Bureau of Meteorology issued a severe heatwave warning for Perth and parts of WA’s South West last week, ahead of a November week with five days over 35°C. The heat also contributed to dangerous bushfire conditions, including a blaze in Wanneroo which has destroyed dozens of homes.

Perth has a historic baseline averaging 26.4 days over 35°C per year (based on 1994-2022 data). More recently, the electorate experienced over 30 days of 35°C+ heat in 2021 and 2022.

According to CSIRO-BoM projections, under a high emissions scenario, Perth can expect an average of up to 55 days per year over 35°C, and up to 14 annual days over 40°C, by 2090. Yet, if emissions are drastically limited, Perth could keep the average number of days over 35°C to just 29 in 2090, similar to the historic baseline.