excessive heat & adverse reaction ?

I am not new to growing outdoors but this year I am experiencing something for the first time-has been in the high 90 degrees to over 100 here for over 28 days and no rain to boot- I have been giving my girls a good drink every 4 days - the best I can do, which are 12 days into flower, plants have grape size buds at every node, I know it is normal for leaves to yellow during flower, but my girls are losing a lot fo leaves this early on, in my opinion, I read about indoor growers discussing ambient temps so I know it is a concern of theirs-- are my plants experiencing heat realted problems is what I am asking

You need to water more often if the weather is very hot.