Heat Risk in Marion, SA: 2026 Assessment
Heat Risk Score
7.0/10Marion is susceptible to heatwaves, with increasing average temperatures and more frequent extreme heat days. This poses a risk to vulnerable populations, especially during summer.
Key Facts
- Heat Risk
- Marion is susceptible to heatwaves, with increasing average temperatures and more frequent extreme heat days. This poses a risk to vulnerable populations, especially during summer.
- Trend
- increasing
- Suburb
- Marion, SA
- Overall Risk
- Medium
- Postcode
- 5043
- Highest high-risk exposure
- 11.1% of land (surface flood)
Heat Risk Analysis
Marion in South Australia 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 Marion 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.
Average maximum temperatures in January are expected to increase in the coming years, leading to more frequent heat stress events. Vulnerable populations should take precautions during heatwaves.
Get an address-level heat risk assessment from ClimateNest for Marion including cooling cost estimates, heatwave vulnerability scoring, and adaptation recommendations tailored to your property.
Marion (postcode 5043) 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 surface flood (11.1% of land in high-risk zones), bushfire (6.1% of land in high-risk zones), coastal inundation (3.7% of land in high-risk zones). Exposure is not uniform across Marion — 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
Record high temperatures were recorded across Adelaide, including Marion, leading to increased demand on emergency services.
A prolonged heatwave resulted in heat stress and health concerns for vulnerable residents.
Adaptation & Mitigation Actions
Upgrade Stormwater Infrastructure
Near-termInvest in upgrading stormwater drainage systems to handle increased rainfall intensity and reduce the risk of flooding.
Est. cost: High
Increase Green Spaces
ImmediatePlant more trees and create green spaces to reduce the urban heat island effect and provide shade during heatwaves.
Est. cost: Medium
Implement Coastal Protection Measures
Long-termConstruct seawalls and implement other coastal protection measures to mitigate the impacts of sea level rise and coastal erosion.
Est. cost: Very High
Develop a Heat Action Plan
ImmediateCreate a heat action plan to protect vulnerable populations during heatwaves, including establishing cooling centers and providing public health advice.
Est. cost: Low
Council & Emergency Services
Explore Marion Risk Reports
View other climate risk assessments for Marion:
Frequently Asked Questions
How hot does Marion get in summer?
Marion in South Australia experiences summer temperatures consistent with the regional climate. BOM publishes historical temperature data for weather stations near Marion. Get a property-specific heat exposure assessment with projected cooling costs from ClimateNest.
Is extreme heat increasing in Marion?
Australia-wide, extreme heat events have become more frequent since the mid-20th century, and this trend is consistent with CSIRO climate projections for South Australia. Continued warming is likely through 2050 under all emissions scenarios.
How does heat affect energy costs for Marion 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 Marion and the performance of your building envelope.
What heat mitigation measures work best in Marion?
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 Marion is exposed to high surface flood risk?
ClimateNest's hazard overlay maps 11.1% of Marion in high-risk zones for surface flood, with a further 64.5% 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 Marion Safe from Climate Risk?
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