Australia in December: what to expect

Australia in December is two countries in one. The south-east coast — Sydney, Melbourne, Canberra, Adelaide — is in early summer: warm, mostly sunny, with sea temperatures good for swimming and the odd cool change. Melbourne is the wildcard, capable of a 15 °C grey day and a 40 °C scorcher in the same week. Heatwaves are a real risk in the south, and with them bushfire danger, so check fire warnings before any drive out of the cities.

The tropical north is in its wet season. Cairns, Darwin and the Kimberley get high humidity, afternoon storms, monsoon downpours and cyclone risk, and box jellyfish make many beaches unsafe for swimming. The Red Centre is simply hot: Uluru and Alice Springs often pass 40 °C, and some walks close from 11:00. Tasmania is the pleasant exception — long daylight, mild days and the start of the walking season.

December is the busiest and most expensive month of the Australian year. School summer holidays run from mid-December to late January, Christmas and New Year follow immediately, and domestic travellers fill the coast at the same time as international visitors arrive for the warm weather. Beach towns, coastal campsites and anything near Sydney Harbour sell out first.

Book flights, accommodation and hire cars as early as you can — for the Christmas–New Year week, months ahead is normal. If your dates are flexible, the first ten days of December are noticeably calmer and cheaper than the last ten. Expect peak pricing on domestic flights between capital cities, and note that many cafés, restaurants and tour operators close on Christmas Day itself.

The month is built around the summer holidays. Sydney's New Year's Eve fireworks over the harbour are the headline event: vantage points are ticketed or claimed from the morning, and harbour-view beds book out months ahead. Christmas Day itself is quiet — many shops, cafés and attractions close — so plan food and transport in advance.

Cricket fans get the Boxing Day Test in Melbourne and the Sydney Test in early January, both big drawcards. Carols by Candlelight concerts run in the capitals in the weeks before Christmas, and beach towns hold their own smaller New Year gatherings. In the north, the wet season means some tours and roads operate on reduced schedules, so confirm before booking.

Put your time in the south. Sydney is at its best: harbour ferries, Bondi and the coastal walk, and long evenings. Melbourne rewards a few days of laneway food and day trips, with the Great Ocean Road and the Mornington Peninsula both busy but workable. Canberra's museums and lake are easy in warm weather, and Adelaide pairs with the nearby wine regions.

Tasmania is arguably the pick of the month: long daylight, mild temperatures and the start of the walking season in places like Freycinet and Cradle Mountain. Perth and the south-west are dry and hot but reliable for beaches and Rottnest Island. If you want the reef or the outback, this is the wrong month — save Cairns, Darwin, the Kimberley and Uluru for May to October.

Pack for summer with a layer for the south and serious sun protection everywhere. Australian UV is extreme in December, so a hat, sunglasses and high-factor sunscreen matter more than you expect. Bring swimwear, light cotton clothing and comfortable walking shoes. For Melbourne and Tasmania, add a warm mid-layer and a rain jacket — a 15 °C day after a 38 °C one is normal.

For the north, if you go anyway, pack quick-dry clothing, insect repellent and a rain shell, and treat swimming as pool-only in stinger season. A refillable water bottle is essential in the heat. If you are driving outside the cities, carry more water than you think you need and check fire danger ratings each morning.

November is the shoulder: the south is pleasant and the north is turning humid, with fewer crowds and lower prices than December. January is peak summer holiday season — hotter, busier and more expensive, with Australia Day on 26 January. February brings schools back, calmer crowds and still-warm southern beaches, and is a better bet than December for value.

If your trip can move, October and November give you the south at its best without the holiday crush, and September–October is the window that also works for the tropical north and the Red Centre.