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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Across Australia, December mean maximum temperatures range from the low 20s °C in Tasmania and southern coastal areas to the high 30s °C in the interior and north-west. For most capital cities, expect a typical spread of 24–31 °C, with the northern tropics entering the wet season and the south bracing for heatwave events.
What temperature and rainfall ranges should you expect in December?
December is the start of summer proper. Sydney weather December 2025 averages 26 °C max with 12 rainy days; Melbourne December weather typically peaks at 25 °C with 8 rain days; Adelaide sits near 28 °C max with 6 wet days; Brisbane remains humid at 29 °C max with 11 rain days; Perth sees 30 °C max and only 2 rain days, while Darwin endures 33 °C max and 17 rain days (monsoon onset). The sydney weather December celsius figure is about 16–17 °C overnight.
How often do severe storms and heatwaves occur?
Thunderstorm frequency rises across eastern NSW and Queensland; severe storms can bring flash flooding and large hail. Heatwaves are possible in southern capitals, especially when north-westerly winds push hot air south. The Bureau’s Severe Weather Warning page is the best source for live alerts. December weather forecast updates are issued daily on the national Australia weather hub.
Is December a good month to visit southern Australia?
Yes, if you like warm days and moderate crowds. However, heatwaves can spike above 40 °C. Pack layers and check the Melbourne Weather or Sydney Weather pages for real-time forecasts.
How do December conditions differ between Adelaide and Perth?
December weather Adelaide is slightly cooler (28 °C) with a few rain days early in the month, while Perth is hotter and bone-dry, often hitting 30–34 °C with virtually no rain. Both have dry spells and strong UV.
Is the risk of tropical cyclones high in December?
Not yet. Cyclone season runs November to April, but December usually has low activity. Still, northern Australia sees afternoon thunderstorms and the monsoon trough can bring heavy rain to Brisbane Weather and north Queensland.