Overview
Perth and Rottnest Island enjoy a Mediterranean climate with hot, dry summers and mild, wet winters. The best time to visit is from September to May when temperatures are warm, and the days are mostly sunny—ideal for exploring the coast, hiking, and enjoying the island’s beaches.
Temperatures
- Summer (December to February): Daytime temperatures in Perth range from 28°C to 35°C (82°F to 95°F), with occasional hotter days reaching the high 30s°C (90s°F). Rottnest Island tends to be slightly cooler, with highs in the mid-to-high 20s°C (77°F to 86°F). The ‘Fremantle Doctor’ sea breeze often arrives in the afternoon, bringing welcome relief. Nights are warm, averaging 17°C to 20°C (63°F to 68°F).
- Autumn (March to May): Pleasant temperatures range from 20°C to 30°C (68°F to 86°F) during the day, with cooler evenings averaging 12°C to 18°C (54°F to 64°F).
- Winter (June to August): Daytime temperatures range from 18°C to 22°C (64°F to 72°F), while nights can drop to 8°C to 12°C (46°F to 54°F). Winter is the wettest season, though sunny days are still common.
- Spring (September to November): Mild to warm days range from 20°C to 30°C (68°F to 86°F), with cooler evenings averaging 10°C to 16°C (50°F to 61°F). Wildflowers bloom across the region, making it a beautiful time to visit.
Rainfall
Perth and Rottnest Island experience most of their rainfall in winter, particularly from June to August. However, even during this period, the region enjoys plenty of sunny days. The island’s coastal location means rain showers can be brief and scattered. Summer is typically very dry, with little to no rainfall.
Both Perth and Rottnest Island offer comfortable conditions year-round, with warm, sunny weather making them perfect for outdoor adventures and beachside relaxation.
