Melburnians have tossed and turned through the city's hottest March night since records began.
Temperatures hovered around 30C for most of Tuesday night, the lowest temperature of 29C recorded just before 1am on Wednesday, the Bureau of Meteorology says.
The all-time record until Tuesday night was 26.9C recorded on March 18 in 2008.
"We comprehensively beat that record," senior forecaster Richard Carlyon told AAP.
The weather bureau says some relief is on the way with a moderate cool change keeping Wednesday's city temperature to 33C - slightly more bearable than Tuesday's 40C.
Melbourne's CBD hit 38.9C on Tuesday, just 2.7C below the hottest March day ever recorded on March 11 in 1940.
But the city still recorded its hottest March day in eight years, the suburb of Moorabbin hitting an uncomfortable 40.8C.
During the next four nights the sticky humidity is expected to remain with unseasonably high overnight temperatures in the 20s.
Cooler conditions are forecast for the weekend but Victorians should not expect a big drop in temperatures - it's anticipated to still reach the high 20Cs next week.
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