Here in the mountains north of LA, summer is not nearly the insurmountable PITA that it was in LA, where I lived the first 30 of my 37 years. For me, anything over 75 (sorry Centigradians) is unpleasant, so luckily, only July and August are a bother here. June still gets nighttime temps into the 30s, and as soon as August changes to September, it cools off instantly, like clockwork (unlike LA, which can be a nightmare through Halloween, no pun intended). Upper 80s is as hot as it ever gets here (like today), but it always cools off fast as soon as the sun tucks itself behind the mountains (I do love the extended twilight this provides). That said, being an outdoor smoker exclusively, I actually smoke more often in the summer than in the winter. Being out in the snow freezing my nads off trying to enjoy even a small bowl of [insert English/Balkan blend here] just isn't my idea of a good time. But back to summer...once the east-facing side of the deck is in shade, it's a great place to sit and watch the birds as I have a pipe, which I will in fact be doing as soon as I'm done on the WAYS thread following this entry. There's almost always a breeze blowing through, which sweetens the deal further. So to answer the OP's question, it doesn't really affect me much up here on my lofty perch in the pines.
On a side note, it's typically pretty low humidity here, but this summer and the previous one have done away with that trend; I've never felt such humidity in my life! On the plus side, it's been the first time in my life I've had monsoon rains come through, and that cools the temps even more. These rains also create some pretty spectacular views, especially to the west. Exhibit A:
It's like the Creator Himself is sitting on His throne, radiating sunbeams outward in every direction. Thou shalt not puff thine Rhodesian too fast, lest ye get tongue-bite!