For the last 8 yrs we have been going during this time period and have had very warm days and cool nights
and very little rain.
We also have had a day or 2 of cool days and rain.
Best bet is to pack a pair of jeans or pants and bring a sweatshirt or just wait til you get there and buy a sweatshirt. I usually bring either jeans or a pair of capris for those cool days that can happen.