Kogarah weather

Kogarah weather and local climate guide

Kogarah's St George ridge position

Kogarah sits on a gentle ridge in Sydney's St George district, at approximately 20-40 metres elevation between the Georges River to the south and the Cook's River to the north. This mid-elevation, mid-distance-from-coast position (approximately 4 kilometres from Botany Bay) gives Kogarah a moderate climate influenced by both Botany Bay and the Georges River. Summer maximums average 27-29 degrees, with bay breezes providing afternoon cooling on most days. Winter minimums of 7-8 degrees benefit from the proximity of two river systems that prevent extreme overnight cooling.

Dual river influence

Kogarah's position between the Georges River and Cook's River means it receives maritime-moderated air from both waterways. The Georges River to the south is the larger influence, with its broad estuary providing a thermal mass that moderates temperatures within 1-2 kilometres of its banks. The bay breeze from Botany Bay channels up the Georges River corridor, reaching Kogarah from the south-southeast on summer afternoons. This dual water influence keeps Kogarah notably milder than inland suburbs at similar distances from the coast, with a temperature profile closer to suburbs directly on the bay.

Hospital precinct microclimate

St George Hospital and its associated medical precinct create a localised warm zone in Kogarah's centre. The large building complex generates urban heat through thermal mass, air conditioning waste heat, and vehicle traffic associated with the hospital's 24-hour operation. This precinct is typically 1-2 degrees warmer than surrounding residential streets on summer evenings. The hospital's importance to the community means this heat island is accepted as a trade-off for essential services. Nearby residential streets with tree cover provide effective contrast just one block from the hospital boundary.

Rainfall and drainage

Kogarah receives approximately 1,050-1,100 millimetres of annual rainfall. The suburb's ridge position provides natural drainage toward both river systems. Flash flooding is rare on the ridge itself but can affect low-lying areas near the Georges River during extreme events. The March 2022 floods demonstrated vulnerability in the river-adjacent areas of South Kogarah. The Cook's River catchment to the north can also exceed capacity during sustained heavy rainfall, affecting properties near its tributaries. The railway cutting through the suburb occasionally fills with stormwater during intense rainfall events.

Wind patterns

Kogarah receives moderate winds from multiple directions without extreme exposure. The northeast sea breeze arrives via the Botany Bay corridor from the east-northeast, typically by early afternoon in summer. Southerly changes arrive with moderate force, somewhat attenuated by the distance from the coast and intervening terrain. The Georges River corridor channels winds from the south-southwest during bay breeze events. Overall wind speeds are lower than directly coastal suburbs but sufficient to provide ventilation on hot days. The commercial centre along Railway Parade is somewhat sheltered by surrounding buildings.

Kogarah seasonal living

Kogarah's moderate climate supports comfortable year-round outdoor living. Summer is warm but rarely extreme, with Carss Park and the Georges River foreshore providing cooling recreation. The bay influence means summer humidity can be notable on northeast wind days, feeling muggy without being oppressively hot. Autumn is consistently pleasant with mild temperatures ideal for the suburb's parks and walking paths. Winter is mild compared to western suburbs, with the river influence keeping frost rare (fewer than 3 times per year in sheltered spots). Spring brings progressive warming and increased activity along the foreshore paths.

Explore nearby suburb forecasts

See how Kogarah's weather compares to its neighbours: Hurstville weather, Rockdale weather and Cronulla weather. Or browse all Sydney suburb forecasts.