Heat Risk in St Marys, TAS: 2026 Assessment
Heat Risk Score
4.0/10St Marys is likely to experience more frequent and intense heatwaves. This poses a risk to vulnerable populations.
Key Facts
- Heat Risk
- St Marys is likely to experience more frequent and intense heatwaves. This poses a risk to vulnerable populations.
- Trend
- increasing
- Suburb
- St Marys, TAS
- Overall Risk
- Medium
- Postcode
- 7215
- Highest high-risk exposure
- 13.2% of land (surface flood)
Heat Risk Analysis
St Marys in Tasmania 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 St Marys 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, with potential impacts on elderly and vulnerable residents.
Get an address-level heat risk assessment from ClimateNest for St Marys including cooling cost estimates, heatwave vulnerability scoring, and adaptation recommendations tailored to your property.
St Marys (postcode 7215) 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 (13.2% of land in high-risk zones), extreme wind (9.1% of land in high-risk zones), riverine flood (3.1% of land in high-risk zones). Exposure is not uniform across St Marys — 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
St Marys experienced a prolonged heatwave with temperatures exceeding 35°C for several days.
Adaptation & Mitigation Actions
Develop a Bushfire Management Plan
ImmediateCreate a comprehensive plan for bushfire preparedness, including clearing vegetation, maintaining firebreaks, and establishing evacuation routes.
Est. cost: Low
Upgrade Drainage Infrastructure
Near-termImprove drainage systems to reduce the risk of flooding during heavy rainfall events.
Est. cost: Medium
Implement a Heatwave Action Plan
Near-termDevelop a plan to protect vulnerable populations during heatwaves, including establishing cooling centers and providing public awareness campaigns.
Est. cost: Low
Promote Water Conservation
Long-termEncourage water conservation measures to reduce water stress during periods of drought and heat.
Est. cost: Low
Community Education Programs
Near-termRun workshops and distribute information on how residents can prepare for and respond to climate-related hazards.
Est. cost: Low
Council & Emergency Services
Explore St Marys Risk Reports
View other climate risk assessments for St Marys:
Frequently Asked Questions
How hot does St Marys get in summer?
St Marys in Tasmania experiences summer temperatures consistent with the regional climate. BOM publishes historical temperature data for weather stations near St Marys. Get a property-specific heat exposure assessment with projected cooling costs from ClimateNest.
Is extreme heat increasing in St Marys?
Australia-wide, extreme heat events have become more frequent since the mid-20th century, and this trend is consistent with CSIRO climate projections for Tasmania. Continued warming is likely through 2050 under all emissions scenarios.
How does heat affect energy costs for St Marys 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 St Marys and the performance of your building envelope.
What heat mitigation measures work best in St Marys?
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 St Marys is exposed to high surface flood risk?
ClimateNest's hazard overlay maps 13.2% of St Marys in high-risk zones for surface flood, with a further 60.7% 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 St Marys Safe from Climate Risk?
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