Melbourne's temperature dropped 8 degrees in 11 minutes as a cool change hit the city on Sunday morning following an "oppressive" night.
The mercury fell from 33.1 degrees at 10.59am to 25 degrees at 11.10am.
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Melbourne weather: weekend scorcher
Victorians are being asked to be bushfire-ready as the state faces a very high fire danger day on Saturday wih temperatures expected to soar to 40 degrees in parts of the state.
The overnight low was 28 degrees at 4.42am. But despite the temperature hovering around 30 degrees for much of the night, no records were broken.
Bureau of Meteorology senior forecaster Dean Stewart said the overnight minimum was well above the normal January overnight minimum of 13.6.
But it fell 2 degrees short of the record minimum of 30.6 degrees on January 30, 2010.
"It's fairly uncomfortable but not record breaking ... this is up near the top end of the warm nights but not at the extreme," he said.
Mr Stewart said it would be easier to sleep on Sunday night, with an overnight minimum of 17 degrees and a top of about 25 degrees on Monday.
The week ahead will also bring milder weather across Victoria with temperatures expected to stay below 30 degrees in Melbourne until Friday.
In NSW, however, a heatwave is settling in. Temperatures are set to reach 38 degrees in Penrith on Monday and remain above 35 degrees until Thursday.
Paramedics received 30 heat-related calls across Victoria on Saturday and another 15 on Sunday.
Saturday's calls included six cases of children locked in cars, although none required treatment, while Sunday saw one call for a child in a car.
"By mid to late afternoon, we should have significant lower temperatures, from low to mid-20s," senior forecaster Richard Carlyon said.
Fire crews were on alert amid high and very-high ratings throughout the state. Grassfires were burning near Keilor North and Mildura on Sunday morning but were brought under control.
On Saturday, the mercury peaked at 36.7 degrees at 3.06pm in Melbourne.
Several people were injured in accidents in and around water on Saturday and Sunday.
A man on a wakeboard hit the water hard at Eildon on Sunday, suffering critical injuries, while a boy had to be pulled from the bottom of a swimming pool at Cheltenham. The boy was taken to hospital in a serious condition.
Saturday's toll was far worse.
An Ambulance Victoria spokesman said a man in his 30s was in critical condition after being pulled from the water at Lerderderg Gorge just before 1pm.
He is believed to have become unconscious after jumping into the water feet first. The man was pulled from the water by bystanders and treated by paramedics before being taken to the Royal Melbourne Hospital.
A swimmer in his 30s has head and back injuries after he slipped on rocks after getting out of the water at Wilsons Promontory about 2.15pm . The man fell about two metres . He was winched from the remote area by an air ambulance helicopter and flown to Latrobe Regional Hospital in a stable condition.
A man aged in his 40s was swimming when he hit his head on the end of the pool at Mulgrave at 7pm. He was taken to Dandenong Hospital in a stable condition.
A woman in her 20s hurt her back when she dived into a pool at Dandenong just before 5pm. She was treated by paramedics and taken to Dandenong Hospital in a stable condition.
Hot Melburnians took to social media to tweet about the heat.
#melbweather Second sleepless night for me. There's a giant spider outside my room and I just opened the window to let in some 'cool' air.🙁
— flipswitchG (@flipswitchG) January 7, 2017
It's 4.40 am and 29 degrees in Melbourne 😥#melbweather pic.twitter.com/AjA2sH3dKZ
— Stacey-Lee (@day_winters) January 7, 2017
What fresh hell is this??!
— Georgia Scutt (@GeorgiaScutt) January 7, 2017
🔥🔥🔥😔😭#melbweather pic.twitter.com/MX7oRoIbZ0
- with Goya Dmytryshchak, Emily Woods, Steve Lillebuen