June in Australia is the first month of the Australian winter. Except at high altitudes where you can expect snow, the temperature is not as harsh as you might imagine winter would be.
If you're thinking of far north Australia, the temperature in the northern cities of Darwin in the Northern Territory, ranging from 20 C (68 F) to the 30 C (86 F), and Cairns in Queensland, about 17 C (63 F) to the 20 C (68 F), would remain fairly tropical.
You can, in fact, go diving in the Great Barrier Reef during the winter, and do a lot of outdoor activities besides.
Blowing Hot and Cold
In Alice Springs in Australia's Red Centre, it will be warm in the daytime, just below 20 C (68 F) on average, and cold at night, an average of around 5 C (41 F).
Expect an average range of 8 C (46 F) to 16 C (61 F) in Sydney and a few degrees cooler in Melbourne.
All temperature figures quoted in this article are averages and actual temperature on the day may go higher or lower.
Little rain is expected in Darwin and Alice Springs, perhaps a little bit more in Melbourne, Canberra, and Hobart but not enough to be a problem. The biggest rainfalls would be in Perth, followed substantially less in Sydney and Brisbane.
Queen's Birthday Holiday
June's public holiday in all states and territories except Western Australia is the Queen's Birthday holiday on the second Monday in June. Western Australia has its Foundation Day, a public holiday in the state, on the first Monday in June.
Start of the Ski Season
The Queen's Birthday holiday weekend is generally taken as the official start of the ski season.
The major ski resorts are in the Snowy Mountains in New South Wales and in the high country of Victoria. And don't discount Tasmania; you can ski there, too.
Blue Mountains Festival
For those who miss having Christmas in the northern winter—Australia's Christmas is in the southern summer—there's Yulefest in the Blue Mountains when they transpose the trappings of a cold December Christmas into the months of June, July, and August.
There'll be roaring log fires, wreaths of holly, carols, Santa Claus, hot roast dinners and there might even be snow.