Heat Risk in Onslow, WA: 2026 Assessment
Is Onslow Safe from Climate Risk?
Enter your address below for an instant climate risk assessment for Onslow, Western Australia, covering flood, bushfire, sea level rise and more.
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Heat Risk Score
Not assessedOnslow experiences extreme heat, particularly during the summer months. Rising temperatures due to climate change are expected to exacerbate heat stress on residents and infrastructure.
Key Facts
- Heat Risk
- Onslow experiences extreme heat, particularly during the summer months. Rising temperatures due to climate change are expected to exacerbate heat stress on residents and infrastructure.
- Trend
- increasing
- Suburb
- Onslow, WA
- Overall Risk
- High
- Postcode
- 6710
Heat Risk Analysis
Onslow in Western Australia faces location-specific extreme heat risk. The Bureau of Meteorology (BOM) reports that Australia's average temperature has increased by approximately 1.5 °C since 1910, with the frequency of extreme heat days rising across most regions.
The urban heat island (UHI) effect can make built-up areas of Onslow warmer than surrounding rural areas, particularly on summer nights. Dark roof materials, limited tree canopy cover, and heat-absorbing surfaces contribute to localised heat stress that varies by property.
Onslow experiences extreme heat during the summer months, with average maximum temperatures in January exceeding 38°C.
Get an address-level heat risk assessment from ClimateNest for Onslow including cooling cost estimates, heatwave vulnerability scoring, and adaptation recommendations tailored to your property.
ClimateNest assesses hazards at the address rather than the suburb, because exposure varies street by street within Onslow. An address-level check is what tells you about a specific property before you buy, sell or insure it.
Local Hazard Evidence
Historical Events
A prolonged heatwave affected Onslow, with temperatures exceeding 40°C for several consecutive days.
Adaptation & Mitigation Actions
Upgrade Coastal Defenses
ImmediateInvest in seawalls and other coastal defenses to protect against sea level rise and storm surge.
Est. cost: High
Improve Heatwave Preparedness
ImmediateDevelop and implement heatwave early warning systems and public awareness campaigns.
Est. cost: Medium
Enhance Flood Management
Near-termImprove drainage infrastructure and implement flood-resistant building codes.
Est. cost: Medium
Strengthen Bushfire Resilience
Near-termImplement bushfire mitigation measures, such as controlled burns and vegetation management.
Est. cost: Medium
Promote Water Conservation
Long-termEncourage water conservation practices to reduce water stress during periods of drought.
Est. cost: Low
Council & Emergency Services
Explore Onslow Risk Reports
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Frequently Asked Questions
How hot does Onslow get in summer?
Onslow in Western Australia experiences summer temperatures consistent with the regional climate. BOM publishes historical temperature data for weather stations near Onslow. Get a property-specific heat exposure assessment with projected cooling costs from ClimateNest.
Is extreme heat increasing in Onslow?
Australia-wide, extreme heat events have become more frequent since the mid-20th century, and this trend is consistent with CSIRO climate projections for Western Australia. Continued warming is likely through 2050 under all emissions scenarios.
How does heat affect energy costs for Onslow properties?
Higher temperatures increase cooling demand, which raises electricity costs. ClimateNest provides energy cost projections based on your property's specific exposure to extreme heat days in Onslow and the performance of your building envelope.
What heat mitigation measures work best in Onslow?
Effective heat mitigation includes light-coloured roofing (cool roofs), ceiling and wall insulation, double-glazed windows, external shading, cross-ventilation design, and increasing tree canopy around the property. These measures reduce indoor temperatures and cooling costs.
Is Onslow Safe from Climate Risk?
Enter your address below for an instant climate risk assessment for Onslow, Western Australia, covering flood, bushfire, sea level rise and more.
What A$49 could save you from
*Industry sources: ICA, APRA, RBA
Full report from A$49 · Australian addresses only · 8 hazard scores · Insurance trajectory · 2030 & 2050 projections