Sydneysiders have sweated through what could be the hottest November night on record.
Temperatures climbed to a top of 28.4 degrees Celsius and never dipped below 26.5C, Bureau of Meteorology (BOM) duty forecaster Dmitriy Danchuk said.
Previously, the hottest November night on record was in 1967, when the minimum temperature was 24.8C.
The average minimum temperature for November is 15.6C.
"So last night we had temperatures that were 10.9 degrees above average," Mr Danchuk said.
"That's a pretty rare occasion. The last time we had high temperatures like this was on November 14, 1976.
"This could be a record."
The highest temperature for November was recorded at 12.08am (2.08am NZ time) today, while the minimum temperature occurred at 6.01am (8.01am NZ time).
Sydney's western suburbs had a slightly cooler night, with highs of 27.4C and lows of 21.9C.
The city is in for some cool relief later today, with a southerly change expected about 3pm (5pm NZ time).
Temperatures are expected to drop to about 24C and remain at that level, Mr Danchuk added.
During the day, the city will sizzle again with highs of up to 31C expected.
"But it should cool down later," Mr Danchuk said.