No matter how you're planning to spend your Australia Day this year, it might be best to pack a cardigan.
The Bureau of Meteorology expects Melbourne to be cloudy on Thursday morning, with a top of 23 degrees.
![The sun is forecast to come punching through about 11am on Australia Day.](/web/20170125013535im_/http://www.smh.com.au/content/dam/images/g/s/t/m/a/x/image.related.articleLeadwide.620x349.gty6um.png/1485303657308.jpg)
But don't fear - the sun is due to punch through around 11am.
Senior forecaster Michael Efron said there won't be a cloud in sight from around lunchtime onwards.
"Around Melbourne, we're looking at a top of 24 degrees," he said.
"It'll be a little warmer across Gippsland, with 26 degrees in Bairnsdale and Sale. It looks like temperatures will be relatively mild along the coast.
"Down at Warrnambool it'll be around 21 degrees, and around Aireys Inlet, 22."
For those heading out on Port Phillip Bay, winds will be around 10 to 15 knots in the morning and a little stronger in the afternoon.
"It'll be strong for some boats out there, but relatively light winds in the morning," Mr Efron said.
Further north, however, it will feel like a regular summer's day - much to the delight of those planning to spend Australia Day swimming or playing a round or two of backyard cricket.
The mercury will climb above 30 degrees in towns such as Swan Hill, Mildura, Bendigo, Shepparton and Wodonga.
Meanwhile, assistant commissioner Debra Robertson urged motorists to take care on Australia Day.
"The smallest mistake can have devastating consequences," she said.
"Four people died in four separate collisions over the Australia Day long weekend last year, and 72 people were seriously injured. I just don't want this repeated."