SUNDAY will mark the spring equinox in the southern hemisphere, meaning equal hours of night and daylight.
From Sunday onwards, days will become longer than nights.
The Weather Channel's chief meteorologist Dick Whitaker said the equinox was a reminder the warmer months were just around the corner.
"At the equinox there is a point on the equator where the sun will be directly overhead. As the days then become longer than the nights, temperatures continue to rise across Australia as we move towards the summer months," he said.
"This will continue right up until December 21 when we reach the summer solstice, which marks the longest day of the year in the southern hemisphere."