Perth, Western Australia’s capital, is renowned for its sun-drenched climate and seasonal rainfall patterns. Classified as a hot-summer Mediterranean climate (Köppen Csa), the city experiences hot, dry summers from December to March, with February being the hottest month. Average daily sunshine reaches 8.8 hours, translating to around 3,200 hours annually and 138.7 clear days, earning Perth the title of Australia’s sunniest capital.

Summer temperatures regularly exceed 35 °C (95 °F) on approximately 26 days each year, with temperatures surpassing 40 °C (104 °F) on roughly five days. The highest recorded temperature in Perth reached 46.2 °C (115.2 °F) in February 1991. Despite the heat, summer afternoons often benefit from the "Fremantle Doctor," a cool south-west sea breeze that alleviates high north-easterly temperatures. Rainfall during summer is sporadic and can include thunderstorms, weak cold fronts, or remnants of tropical cyclones from the north-west.

Winters in Perth are relatively mild and wet, with most rainfall occurring between May and September. Minimum temperatures occasionally drop below 5 °C (41 °F), with the lowest recorded temperature in the metropolitan area reaching −3.4 °C (25.9 °F). Frost may form on rare occasions, and while snow has never been recorded in the CBD, light snowfalls have occurred in the outer Perth Hills, including Kalamunda, Roleystone, and Mundaring, most recently in 1968.

Since the mid-1970s, Perth has experienced changes in rainfall patterns, including reduced winter rainfall and increased extreme summer events. Notable examples include slow-moving storms in February 1992, heavy rainfall from a tropical low in February 2017, and the remnants of ex-Tropical Cyclone Joyce in January 2018. Severe thunderstorms, such as the one on 22 March 2010, have also caused significant damage due to large hail and heavy precipitation.

Perth’s climate combines abundant sunshine, hot summers, and seasonal rains, offering residents and visitors a lifestyle shaped by its Mediterranean conditions, outdoor activities, and scenic coastal landscapes.