It's only 2 months late
Don't think it'll reach 31 in the city and certainly not in bayside suburbs with a seabreeze likely, but out here at Berwick it should easily, it's on 28 now. Frankston ffreezing their buns off on 19C!!!! I'm gonna say 26-27C for the city today.
Not convinced about tomorrow, somehow I can't see 40C happenening, masses of cloud in the bight are already starting to reach Victoria and there is already talk of a (unforecasted) change moving thru tomorrow evening
Watch the Eucla and Nullabour area today.