Heat Risk in Illawong, NSW: 2026 Assessment
Heat Risk Score
7.1/10Illawong is likely to experience more frequent and intense heatwaves. This poses a risk to vulnerable populations, especially during summer.
Key Facts
- Heat Risk
- Illawong is likely to experience more frequent and intense heatwaves. This poses a risk to vulnerable populations, especially during summer.
- Trend
- increasing
- Suburb
- Illawong, NSW
- Overall Risk
- Medium
- Postcode
- 2234
- Highest high-risk exposure
- 20.2% of land (bushfire)
Heat Risk Analysis
Illawong in New South Wales faces elevated 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 Illawong 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.
Heatwaves are becoming more frequent and intense in the Sydney region.
Get an address-level heat risk assessment from ClimateNest for Illawong including cooling cost estimates, heatwave vulnerability scoring, and adaptation recommendations tailored to your property.
Illawong (postcode 2234) is tracked in ClimateNest's suburb hazard model, which maps the share of the suburb's land exposed to each hazard at high and moderate levels. The suburb's highest high-risk exposures are bushfire (20.2% of land in high-risk zones), riverine flood (10.9% of land in high-risk zones), surface flood (5.8% of land in high-risk zones). Exposure is not uniform across Illawong — individual properties can sit well above or below these averages, so an address-level check is recommended before buying, selling or insuring.
Local Hazard Evidence
Historical Events
Prolonged heatwave conditions led to increased demand for electricity and health concerns.
Adaptation & Mitigation Actions
Improve Flood Defenses
Near-termInvest in infrastructure to mitigate flood risk, such as improved drainage systems and flood barriers.
Est. cost: High
Bushfire Preparedness
ImmediateImplement bushfire management strategies, including vegetation clearing and community education programs.
Est. cost: Medium
Heatwave Action Plan
Near-termDevelop a heatwave action plan to protect vulnerable populations during extreme heat events.
Est. cost: Low
Sustainable Urban Planning
Long-termPromote sustainable urban planning practices to reduce the urban heat island effect and improve water management.
Est. cost: Medium
Council & Emergency Services
Explore Illawong Risk Reports
View other climate risk assessments for Illawong:
Frequently Asked Questions
How hot does Illawong get in summer?
Illawong in New South Wales experiences summer temperatures consistent with the regional climate. BOM publishes historical temperature data for weather stations near Illawong. Get a property-specific heat exposure assessment with projected cooling costs from ClimateNest.
Is extreme heat increasing in Illawong?
Australia-wide, extreme heat events have become more frequent since the mid-20th century, and this trend is consistent with CSIRO climate projections for New South Wales. Continued warming is likely through 2050 under all emissions scenarios.
How does heat affect energy costs for Illawong 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 Illawong and the performance of your building envelope.
What heat mitigation measures work best in Illawong?
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.
What share of Illawong is exposed to high bushfire risk?
ClimateNest's hazard overlay maps 20.2% of Illawong in high-risk zones for bushfire, with a further 67.3% in moderate-risk zones. Suburb-level exposure is not uniform — individual properties can differ from these averages, so an address-level check is recommended.
Is Illawong Safe from Climate Risk?
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