Perth Weather and Climate Guide: What to Expect Year-Round

Perth has the most sunshine of any Australian capital city (average 8.8 hours of sunshine per day, with 3,000+ annual sunshine hours) and a Mediterranean climate that is unique among Australian capitals: hot, dry summers and mild, wet winters. The "Fremantle Doctor" afternoon sea breeze is one of the world's most reliable and powerful summer sea breezes, arriving from the south-west across the Indian Ocean each afternoon from November to March to cool Perth's hot summer days.

Summer (December to February) — Perth summers are hot and very dry, with average maximums of 31 to 33°C and occasional extreme heat events above 40°C (Perth has recorded multiple days above 45°C in extreme events). The dryness is the key difference from Brisbane or Sydney summer heat: Perth's typical January humidity is around 35 to 45%, making the heat feel more manageable than comparable temperature readings in the eastern cities. The Fremantle Doctor (the Indian Ocean sea breeze) arrives from the south-west in the early afternoon on most summer days, reliably dropping temperatures 5 to 10°C and making Perth's afternoon and evening outdoors very pleasant even on hot days.

Autumn (March to May) — Perth autumn is warm and dry in March and April (26 to 28°C) before the first winter rains arrive in May. April is often considered Perth's finest month for outdoor activity: warm temperatures, reducing summer heat, lower humidity, and the beginning of the wildflower season visible in the Darling Ranges.

Winter (June to August) — Perth winter is mild and wet: average July maximums of 18°C, overnight minimums of 8 to 9°C, and the majority of Perth's annual rainfall (approximately 720mm) concentrated in the winter months. The winter rain is predominantly frontal (arrives with cold fronts from the Southern Ocean) and clear sunny days are common between fronts. Perth winter is warmer than Melbourne or Sydney winter and significantly more pleasant than the Sydney grey-drizzle winter experience.

Spring (September to November) — Perth spring is excellent: the wildflower season (August to October) transforms Western Australia's south-west with extraordinary wildflower displays (Kings Park in Perth has excellent wildflower exhibitions), temperatures moderate from the winter rains to the warm dry 22 to 26°C of October and November, and the outdoor lifestyle resumes.

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