The uppers are into the low to mid 20s for us (and near 30C over SA and southwest NSW). We will be saved the worst (hopefully) by cloud and some rain, but if we get any breaks in the cloud it will fry. The airmass will be record hot or near record hot for December just to our near north.Can't really see it being higher than about 31-33 on Monday and about 30 on Tuesday. (for now)
If it was to go more northerly and the sun come out in full force Melbourne would crack 41 or 42C. I'm not expecting that (fingers crossed).