So much for winter.

With only a handful of days to the end of the month, Sydney is all but certain of registering its warmest winter on record.

Winter's over before it barely bit. Credit:Jonathan Carroll

The Harbour City averaged daily maximums of 19.5 degrees in July and is likely to fall just short of 21 degrees for August. That compares with long-term averages of 19.4 and 20 degrees for May and September, respectively, said Rob Sharpe, a meteorologist with Weatherzone.

“July and August were more like the end of autumn or the start of spring than winter,” Mr Sharpe said.