Wanderlust World Wanderlust World Adelaide enjoys a Mediterranean climate with hot, dry summers and mild, wet winters. January, the hottest month, averages a maximum of 29.1°C (84.4°F), while July, the coldest, averages a minimum of 9.7°C (49.5°F). The annual mean temperature is 18.7°C (65.7°F). Rainfall concentrates in winter (June–August), supporting the region's renowned wine industries in nearby Barossa Valley and McLaren Vale. Summer heatwaves can push temperatures above 40°C (104°F), but low humidity and sea breezes often provide relief. This climate makes Adelaide one of Australia's most livable capitals.