Weather. Melbourne enjoys warm summers, glorious springs, mild autumns and crisp winters. With its variable climate, Melbourne hots up December to February (summer), cools down March to May (autumn), chills out June to August (winter), and warms up again September to November (spring). Melbourne's top temperatures are usually in January and February. Those months are often dry, with hot spells and cooling afternoon breezes off Port Phillip Bay. June and July are the coldest months, and October is the wettest.