Drink plenty of water & something with electrolytes, too. When you feel your face is hot or your heartbeat thumping, & get dizzy if you merely look up or down, it's bad, ya need breaks. Be careful!Over the weekend I managed to mow and weed whack trim. 94 predicted today. One must be careful in this heat. I set up a farm store barrel fan outside in the shade. I take breaks there and quit by 11 AM when the heat advisory starts.