I'd say so. In the north it can be as low as 5c in summer. Where I live it's usually in the low 20s in the summer, which is perfect "summer weather" for me - but earlier this year it got up to 30c for a few days, and that was unbearable.
That sounds pretty awful, if I'm honest. Do you all have air conditioning in your houses over there or are you just used to that temperature?
I'd really love to visit Israel actually, but I doubt I'll go over in the summer now.