It has been down in the 50's here in California at night too. I love it when it finally cools off! I leave my windows open at night, now, and it feel so good. We are in an upstairs apartment, and nobody can reach our windows, LOL .
Being upstairs is is always very warm , and sometimes stuffy . Were still getting warm temps in the day though. so warm people wear shorts. LOL .Fall time is my favorite time of yr. in Ca.