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PROPERTY ANALYTICS

Climate Risk in Semaphore, SA

Semaphore, South Australia· City of Port Adelaide Enfield· 5019
Medium Risk
Updated Mar 2026

Semaphore is a coastal suburb in South Australia that faces several climate-related risks, including flooding, heatwaves, and coastal erosion. Sea level rise and increased rainfall intensity are key drivers of these risks. Residents should take steps to prepare for these hazards and protect their property.

Overall Risk Score

5.2/10
Medium

Confidence: Medium

Hazard Breakdown

Flood
6.5
Bushfire
2.1
Heat
6.0
Coastal
6.2

Detailed Hazard Analysis

heat Risk

6.0/10

Semaphore is likely to experience more frequent and intense heatwaves in the future. This could pose a risk to vulnerable populations, such as the elderly and those with chronic health conditions.

Primary Drivers

  • ·Rising global temperatures
  • ·Urban heat island effect

Projections (RCP8.5)

2030

6.8

2050

7.5

Data source

flood Risk

6.5/10

Semaphore faces a moderate risk of flooding due to its low-lying coastal location and proximity to the Port River. Sea level rise and increased rainfall intensity could exacerbate this risk.

Primary Drivers

  • ·Sea level rise
  • ·Increased rainfall intensity
  • ·Storm surge

Projections (RCP8.5)

2030

7.0

2050

7.8

Data source

coastal Risk

6.2/10

Semaphore is vulnerable to coastal erosion and inundation due to sea level rise and storm surges. This could damage infrastructure and property, and displace residents.

Primary Drivers

  • ·Sea level rise
  • ·Storm surge
  • ·Coastal erosion

Projections (RCP8.5)

2030

6.8

2050

7.6

Data source

bushfire Risk

2.1/10

The risk of bushfire in Semaphore is relatively low due to its coastal location and limited vegetation. However, dry conditions and strong winds can still pose a threat.

Primary Drivers

  • ·Dry conditions
  • ·Strong winds
  • ·Proximity to reserves

Projections (RCP4.5)

2030

2.3

2050

2.5

Data source

What This Means for Property Owners

Insurance Outlook

Insurance premiums are likely to increase in Semaphore due to the rising risk of flooding and coastal erosion.

Price Impact

Properties in low-lying areas of Semaphore may experience a decrease in value due to climate change impacts.

Buyer Checklist

  • 1.Check flood maps and historical flood data.
  • 2.Assess the property's vulnerability to coastal erosion.
  • 3.Inquire about the property's insurance history and premiums.
  • 4.Consider the potential impact of sea level rise on the property's value.

Local Climate Evidence

Flood Evidence

Nearest Waterway
Port River
Elevation Range
0-5 meters
Flood Zone
Coastal Flood Zone

Semaphore is located in a coastal flood zone and has experienced flooding in the past due to heavy rainfall and storm surges.

View council flood map

Bushfire Evidence

Distance to Bushland
2 km to Glanville Reserve
Planning Overlay
Bushfire Protection Area Overlay
Bushfire Prone Area
Yes

While Semaphore itself is not heavily vegetated, nearby reserves pose a potential bushfire risk during dry periods.

Heat Evidence

Avg January Max Temp
29.5°C
Heat Stress Days/Year
3 days

Semaphore experiences several days above 35°C each summer, increasing the risk of heat stress for vulnerable populations.

Coastal Evidence

Distance to Coast
0.1 km
Sea Level Rise Exposure
High
Erosion Risk
Moderate

Historical Climate Events

2016
stormModerate

A severe storm caused flash flooding and damage to properties in Semaphore.

Source
2007
floodModerate

Heavy rainfall caused flooding in Semaphore, particularly in low-lying areas near the Port River.

Source
2019
heatwaveModerate

Semaphore experienced a prolonged heatwave with temperatures exceeding 40°C for several days.

Source
1948
coastalMajor

A significant storm surge caused widespread coastal erosion and damage to infrastructure along the Semaphore foreshore.

Source

Climate Outlook to 2050

Projections based on CSIRO and BOM climate modelling. Scenario: RCP4.5

HazardToday20302050
flood6.56.8(+0.3)7.3(+0.8)
bushfire2.12.2(+0.1)2.3(+0.2)
heat6.06.6(+0.6)7.5(+1.5)
coastal6.26.6(+0.4)7.2(+1.0)

By 2030, Semaphore is projected to experience a moderate increase in overall climate risk under the RCP4.5 scenario. The most significant changes are expected in heatwave frequency and intensity, followed by coastal inundation and flooding.

CSIRO Climate Projections

Adaptation Recommendations

Upgrade Drainage Infrastructure

Near-term

Improve drainage systems to reduce the risk of flash flooding during heavy rainfall events.

Est. cost: Medium

Learn more

Protect Coastal Ecosystems

Near-term

Restore and protect coastal dunes and vegetation to provide natural buffers against sea level rise and storm surges.

Est. cost: Medium

Learn more

Implement Heatwave Early Warning System

Immediate

Develop a heatwave early warning system to alert vulnerable residents and provide guidance on how to stay safe during extreme heat events.

Est. cost: Low

Learn more

Promote Energy Efficiency

Long-term

Encourage residents and businesses to adopt energy-efficient practices to reduce greenhouse gas emissions and mitigate climate change.

Est. cost: Low

Learn more

Raise Awareness of Climate Risks

Immediate

Educate residents about the risks of climate change and provide information on how to prepare for and respond to climate-related hazards.

Est. cost: Low

Learn more

About Semaphore's Climate Risk Profile

Semaphore, a charming coastal suburb in South Australia, is increasingly vulnerable to the impacts of climate change. Its low-lying location makes it particularly susceptible to flooding and coastal erosion, while rising temperatures are expected to increase the frequency and intensity of heatwaves.

The primary concern for Semaphore is the escalating risk of coastal inundation due to sea level rise. Storm surges, combined with higher sea levels, could lead to significant damage to property and infrastructure along the coastline. The erosion of beaches and dunes also poses a threat to the suburb's natural defenses.

Furthermore, Semaphore is projected to experience more frequent and severe heatwaves in the coming decades. This could have serious health consequences for vulnerable residents, especially the elderly and those with pre-existing medical conditions. The urban heat island effect may exacerbate the impact of heatwaves in densely populated areas.

While the risk of bushfire is relatively low compared to other parts of South Australia, Semaphore is not entirely immune. Dry conditions and strong winds can increase the risk of fire spreading from nearby reserves. It is essential for residents to maintain their properties and be aware of fire safety precautions.

Addressing these climate challenges will require a coordinated effort from local government, residents, and businesses. Implementing adaptation measures, such as improving drainage infrastructure, protecting coastal ecosystems, and promoting energy efficiency, is crucial to building resilience and ensuring the long-term sustainability of Semaphore.

Data sources: BOM · CSIRO · SA SES · City of Port Adelaide Enfield

Local Government Resources

City of Port Adelaide Enfield

Climate StrategyFlood MapsEmergency Services

Frequently Asked Questions

What are the main climate change risks facing Semaphore?

Semaphore is primarily at risk from sea level rise, coastal erosion, increased flooding, and more frequent and intense heatwaves.

How will sea level rise affect Semaphore?

Sea level rise could lead to increased coastal inundation, erosion of beaches and dunes, and damage to property and infrastructure along the coastline.

What can I do to protect my property from flooding in Semaphore?

Consider installing flood barriers, raising electrical appliances, and improving drainage around your property. Check your insurance policy to ensure you are covered for flood damage.

How can I prepare for heatwaves in Semaphore?

Stay hydrated, seek air-conditioned environments, avoid strenuous activity during the hottest part of the day, and check on vulnerable neighbors and family members.

What is the local council doing to address climate change in Semaphore?

The City of Port Adelaide Enfield is implementing various initiatives to reduce greenhouse gas emissions, improve energy efficiency, and adapt to the impacts of climate change. Check their website for more information.

Where can I find more information about climate change projections for Semaphore?

The CSIRO and the Bureau of Meteorology provide climate change projections for South Australia. You can find this information on their websites.

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