Not who you asked but I'm in the desert area of SoCal, it's usually super dry (15-30% unless cloudy) and it's been consistently over 100 for a few weeks now. One of the absolute best things about California is that it always cools off at night, down into to the low 60s most of the summer and 70s during the peak. It can be really hard to dress for sometimes, especially since the sun is so much hotter here than other states I've been to. 105 with a real feel higher than that during the day, maybe 62 with a breeze at night, that's a huge temp variance lol. I appreciate it though, it could be like other places in the country and the world where it's not getting below 80 at night.

The most humid places in Cali are also usually much cooler, due to being near the beach. But it kinda comes out in the wash depending on the day haha. Most of my knowledge is SoCal though, NorCal might be a lot different. California is massive, with tons of different climates, so it's impossible to talk about it without being specific about locations.

You have it worse I promise, that sounds miserable. I'm in northern California, but what the other reply you got said is accurate here as well. Lows in the 60Fs (15C), maybe even the upper 50s, when it's really bad lows are in the mid 70s. Most days I have a fan in the window to cool things off overnight and even if not it gets cool enough that the AC won't work itself to death overnight. I get up early so open all the windows, fans everywhere, and I try to get my place down to 70f (21c), close it all up by 9am, then try to ride it out without ac until the lows drop again. Humidity is very low where I am too. This Sunday it's now saying 105 (41c) for a high and 66 (19c) for a low if that gives you an idea.