Get a window fan and blow in cool air at night then in the morning close all blinds and curtains to keep out the hot air and solar rays.
I forgot about those. I also have a whole house fan and a patio lower house Door fan which I use routinely judiciously. My average PG4E bill is under $150, and the most I have ever paid was around $400 in the last 18 years. Not bad for a two-story 5 bedroom 2-1/2 bath 2200 sf structure.
Just the last few weeks have been a series of extreme extremes... 115F one day.
Just for the record, I do not embrace the man-made Global-warming crap. I am a retired Engineer and know better.