When Is The Longest Day 2024 Australia. This saturday, december 21, the daylength will be about 14 hours and 25 minutes in sydney and about half an hour longer than that in melbourne. As weatherzone explains, the orientation of earth relative to the sun makes the date of the summer solstice the longest day of the year in australia.

This year the summer solstice is the 21st of december 2024. As weatherzone explains, the orientation of earth relative to the sun makes the date of the summer solstice the longest day of the year in australia.