Australia in December: Where the Weather Works, Where It Doesn’t, and What It Costs

Australia in December is early summer in the south and the start of the wet season in the tropical north, so the same month can give you a perfect beach day in Sydney and a week of storms in Cairns. Most December trips go wrong because people plan Australia as one place with one climate. This guide splits the country into the zones that matter, gives you the real numbers for each, and shows where to go, where to wait, and which dates cost the most.

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Australia in December by Region: The 8-City Weather Table

This section gives you the month in numbers for the places most visitors pick. Australia spans the tropics to the cool south, so December brings a different season to each zone. Read across the row for your city, not the national average.

The Sydney and Cairns figures are long-term averages from the Bureau of Meteorology’s Sydney Observatory Hill table and the Bureau’s Cairns Aero table. The other rows are rounded long-term averages for those cities; single years swing hotter or wetter, and a heatwave can push any southern city past 40 °C for a day or two.

The South Is at Its Best: Sydney, Melbourne, Tasmania and the Coast

This section covers the zone that suits December best. From Sydney round to Perth, early summer brings warm days, cool nights and the sea finally warm enough for a proper swim.

Sydney: beaches, harbour and the busiest week of the year

Sydney in December is warm rather than scorching, and the ocean sits around 21 to 23 °C. Bondi, Bronte and Manly are at their liveliest. Swim between the red and yellow flags, because rips are common on the ocean beaches and lifeguards place the flags where it’s safest that day.

Late-afternoon storms roll in on some humid days, often with lightning and short heavy rain. They rarely spoil a whole day. Plan harbour ferries and coastal walks for the morning, and keep an indoor fallback for the late afternoon.

Melbourne and the Great Ocean Road: four seasons in a week

Melbourne’s weather turns fast in December. A cool, grey 19 °C day can follow a hot northerly at 35 °C, and the change often arrives with a sudden wind shift. Pack a jacket even if the forecast looks summery.

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The Great Ocean Road is open and green, and the long evenings let you reach the Twelve Apostles for sunset without rushing. Start early to beat the coach tours, and allow two nights rather than one long day.

Tasmania: the best-timed state in December

Tasmania is mild in December, with highs around 20 to 23 °C and some of the longest days in the country. Walking tracks are snow-free, the lavender and wildflower season begins, and Freycinet, Cradle Mountain and Bruny Island are all at their most reliable.

Weather in the highlands can still turn cold, wet and windy in a few hours. On Cradle Mountain walks, carry a warm layer and a waterproof jacket however bright the morning looks.

Adelaide and Perth: dry heat and long beach evenings

Adelaide and Perth are the driest big cities in December. Perth’s afternoon sea breeze, known locally as the Fremantle Doctor, cools the coast after a hot morning. Rottnest Island, the Margaret River region and the Barossa Valley all suit the month.

The Tropical North in December: Storms, Stingers and the Reef

This section explains the trade-offs north of about Townsville, where December means the start of the wet season. It isn’t a write-off, but it is a different trip from the dry-season photos.

The Great Barrier Reef is still worth seeing in December. Water is warm, and on calm mornings visibility can be good, especially on the outer reef. Book a flexible trip and keep a spare day, because operators cancel when the wind and swell pick up.

The rainforest is lush and full of life. The Daintree and Cape Tribulation are at their greenest, though some unsealed roads become difficult after heavy rain, and river crossings can rise fast. Check road reports before driving north of the Daintree River.

Further west, Darwin and Kakadu enter the build-up and early wet season. Some Kakadu roads and sites close as the rains arrive, and the waterfalls that make the park famous may be reachable only by scenic flight. If Kakadu is a priority, the dry months suit it better.

Uluru and the Outback in December: Only for Early Risers

This section is about the Red Centre, where December is the hardest month for walkers. Central Australia sees extreme heat from about November to March, and days over 36 °C are common, with some well above 40 °C.

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Heat rules shape the day. On days when the forecast or actual temperature reaches 36 °C or more, park authorities close some tracks, such as the Valley of the Winds walk at Kata Tjuta beyond the first lookout, from 11 am. Hotter days bring more closures. Check the official Uluru base walk page before you go.

Climbing Uluru is not permitted. The base walk, around 10 kilometres, takes about three to four hours and is the way to see the rock up close. In December, that means setting off shortly after sunrise.

Crowds and Prices: Why 18 December Changes Everything

This section shows how the calendar moves prices. In December, Australian school holidays matter more than the weather for your budget.

Boxing Day brings two big sporting traditions: the Sydney to Hobart yacht race usually starts on 26 December, and a cricket Test match is usually played at the Melbourne Cricket Ground from the same day. Both fill hotels in those cities, and Hobart gets busy as the yachts arrive a few days later.

Public holiday surcharges are common in cafes and restaurants on 25 and 26 December and on New Year’s Day, often 10 to 15 per cent. They’re legal if they’re shown on the menu, so check before you order.

For crowd tactics that work anywhere in December, see our guide on how to avoid crowds while travelling in December, and if you’re flying long-haul, read how to prepare for flight delays in December.

Two Routes for Australia in December That Work With the Weather

This section gives you two ready-made plans that stay in the zones where December works and touch the harder zones only briefly.

Route 1: 14 days, south-east coast and Tasmania

Route 2: 10 days, Sydney plus the reef, with a buffer

Spend five nights in Sydney, then fly to Cairns for four nights with one spare day. Book the reef trip for your second morning, so a cancellation still leaves a backup day. Stay in Palm Cove or Port Douglas, where beaches have stinger nets, and do the Daintree on a dry morning.

Want sun with less heat and lower prices? Compare our picks of the best warm-weather destinations in December, or see our best destinations for New Year’s Eve round-up for New Year ideas worldwide. Heading to another southern-summer country? Our South Africa in December guide covers the Cape, Kruger and the coast.

When NOT to Go, and the Better Month If You Want X

This section is the honest part. December suits beach and city trips in the south and lets down several classic plans. You can also check any country and month with our free tool, or read our when not to go guide.

Skip December if your trip is mainly the Outback and the Top End. Heat, closures and rain would shape every day. Skip the last ten days of the month too if your budget is tight; the same rooms can cost far more than in early December.

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If February suits you better, our guide to Australia and New Zealand in February covers the late-summer picture.

5 Common Mistakes People Make in Australia in December

This section covers the errors that catch out even experienced travellers.

1. Planning one climate for the whole country

A December trip from Sydney to Cairns to Uluru crosses three seasons. Pack and plan for each zone separately, and put the hardest zone in the middle of the trip so a weather delay doesn’t cost you a flight home.

2. Underestimating the sun

The UV index often reaches the extreme band on clear days, and people burn in under 15 minutes. Use high-factor sunscreen, a hat and a rash vest at the beach, and reapply after every swim.

3. Swimming outside the flags or the nets

On ocean beaches, rips are the main danger; in the tropics, stingers and crocodiles. Swim between the red and yellow flags in the south and inside stinger nets in the north, and never in tropical rivers.

4. Booking the reef on your last day

Reef boats cancel in strong wind. If your only trip is booked for the final morning, a single windy day means you miss it. Book it early in your stay.

5. Leaving Christmas and New Year to the last minute

Australians book summer holidays months ahead. By December, many coastal rentals, campsites and Sydney Harbour New Year’s Eve spots are gone. Book early or plan your trip for the first half of the month.

Australia in December: FAQ

The Bottom Line

Australia in December is a great trip if you follow the climate south: Sydney, Melbourne, Tasmania, Adelaide and Perth are at their best, while the reef needs a flexible plan and the Outback needs dawn starts. Your next step is to pick your zones, then book flights before the school holidays lift prices. For more December ideas, browse our best travel destinations in December section or our Australia guides.