Heat Risk in Number One, NSW: 2026 Assessment
Heat Risk Score
7.0/10Number One is likely to experience more frequent and intense heatwaves. This poses a significant risk to vulnerable populations, such as the elderly and those with pre-existing health conditions.
Key Facts
- Heat Risk
- Number One is likely to experience more frequent and intense heatwaves. This poses a significant risk to vulnerable populations, such as the elderly and those with pre-existing health conditions.
- Trend
- increasing
- Suburb
- Number One, NSW
- Overall Risk
- Medium
- Postcode
- 2424
- Highest high-risk exposure
- 8.8% of land (bushfire)
Heat Risk Analysis
Number One 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 Number One 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.
The suburb experiences several days above 35°C each summer.
Get an address-level heat risk assessment from ClimateNest for Number One including cooling cost estimates, heatwave vulnerability scoring, and adaptation recommendations tailored to your property.
Number One (postcode 2424) 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 (8.8% of land in high-risk zones), surface flood (8.1% of land in high-risk zones), riverine flood (4.8% of land in high-risk zones). Exposure is not uniform across Number One — 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 with record-breaking temperatures impacted the region, leading to heat stress and health concerns.
Adaptation & Mitigation Actions
Improve stormwater drainage
Near-termUpgrade stormwater infrastructure to handle increased rainfall intensity and reduce the risk of flooding.
Est. cost: Medium
Implement a heatwave action plan
ImmediateDevelop a plan to protect vulnerable populations during heatwaves, including cooling centers and community outreach programs.
Est. cost: Low
Strengthen coastal defenses
Long-termInvest in coastal protection measures, such as seawalls and beach nourishment, to mitigate the impacts of sea level rise and coastal erosion.
Est. cost: High
Bushfire hazard reduction
Near-termUndertake regular bushfire hazard reduction activities, such as clearing vegetation and creating firebreaks, to reduce the risk of bushfires.
Est. cost: Medium
Council & Emergency Services
Explore Number One Risk Reports
View other climate risk assessments for Number One:
Frequently Asked Questions
How hot does Number One get in summer?
Number One in New South Wales experiences summer temperatures consistent with the regional climate. BOM publishes historical temperature data for weather stations near Number One. Get a property-specific heat exposure assessment with projected cooling costs from ClimateNest.
Is extreme heat increasing in Number One?
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 Number One 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 Number One and the performance of your building envelope.
What heat mitigation measures work best in Number One?
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 Number One is exposed to high bushfire risk?
ClimateNest's hazard overlay maps 8.8% of Number One in high-risk zones for bushfire, with a further 85.2% 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 Number One Safe from Climate Risk?
Enter your address below for an instant climate risk assessment for Number One, New South Wales, covering flood, bushfire, sea level rise and more.
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