Part of that November week was pretty nice weather. (There was also a lot of rain at least one day.) I agree that, if I saw any escooters, they certainly weren't out in any noteworthy numbers.
I do know one other city where there were lots of them when they were first introduced and six months later they seemed to be much less common.
There was one rainy like the 3rd or 4th day I was there. Otherwise it was in the upper 70's lower 80's. San Diego is known for it's year-round great weather.