Melbourne had its hottest day in 5 years on Friday. It reached 44.5 in my suburb and it felt every degree of that. I was a bit worried about my plants but seasonal family commitments meant I had no time to do anything about protecting them. Fortunately other than a bit of damage to the youngest leaves on one Tommy Toe tomato plant and some of the raspberries, everything emerged unscathed.
I think the combination of a good layer of mulch and morning watering helped avert anything more serious.