I remember one October when I was at Sac State it was 100 or more every single day. Must have been 1981 or so.
I had a Mercury Capri with no a/c and I don't remember being miserable. Funny what you can tolerate when you are young.
I wish I had my car there. Take a drive up to Amador County and zoom the back road that connects Sutter Creek and Volcano (appropriately named Sutter Creek-Volcano Rd). Unbelievable curves! At the end have lunch at the Jug and Rose in Volcano. Then cruise through Daffoldil Hill on the way back. A perfect spring day.