Flood Risk in Thornlie, WA: 2026 Assessment

Thornlie, located in Western Australia, has a notable flood risk profile based on available data including proximity to waterways, elevation, and historical flood events. The Bureau of Meteorology (BOM) maintains river height and flood warning data for catchments across Western Australia.

Historical flood events have impacted properties near the Canning River.

Thornlie faces a moderate risk of flooding, primarily from local rainfall events and the potential for riverine flooding from the Canning River. Properties in low-lying areas are particularly vulnerable.

For a comprehensive property-specific flood assessment including address-level elevation data, flood overlay mapping, and insurance cost estimates, use the ClimateNest full analysis tool. General suburb data cannot replace a site-specific evaluation.

Thornlie sits within ClimateNest's suburb-level hazard model for flood risk. 5% of the suburb's land area is mapped in high-risk flood zones and 68.7% in moderate-risk zones, based on the national hazard overlay. Exposure at this scale varies street by street, which is why an address-level check matters before you buy or insure a specific property in Thornlie.

Thornlie (postcode 6108) 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 (13.6% of land in high-risk zones), tropical cyclone (7% of land in high-risk zones), extreme wind (5.4% of land in high-risk zones). Exposure is not uniform across Thornlie — individual properties can sit well above or below these averages, so an address-level check is recommended before buying, selling or insuring.