You might have forgotten it's still winter.

It was 24 degrees and sunny in Sydney earlier this week. In Melbourne, the forecast for tomorrow is 20 degrees.

We are living through some of the hottest times on record. In fact, this past July was the hottest month ever recorded.

But while this mid-winter warmth may come as a pleasant surprise, climate experts say it signals a troubling future for humans.

Today, National Environment and Climate Editor on Nick O’Malley on the dangers these high temperatures pose, and why it may be just the beginning.