Flood Risk in Hornsby, NSW: 2026 Assessment

Hornsby, located in New South Wales, has a moderate 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 New South Wales.

Flood risk in Hornsby is shaped by local topography and catchment characteristics. Even within a single suburb, elevation differences can significantly change flood exposure. Properties near waterways or in low-lying areas warrant closer assessment.

Moderate flood risk — coastal and riverine flooding possible along major waterways

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.

Hornsby sits within ClimateNest's suburb-level hazard model for flood risk. 7.1% of the suburb's land area is mapped in high-risk flood zones and 68.1% 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 Hornsby.

Hornsby (postcode 2077) 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), surface flood (10.7% of land in high-risk zones), riverine flood (7.1% of land in high-risk zones). Exposure is not uniform across Hornsby — individual properties can sit well above or below these averages, so an address-level check is recommended before buying, selling or insuring.