That sounds like normal mileage with high AC use.
https://priuschat.com/threads/how-to...a-c-use.97814/
https://priuschat.com/threads/ac-com...-on-mpg.95749/
The INL found that AC on max with full blower drops mpg from 52.7 to 41.3.
https://avt.inl.gov/sites/default/fi...hevamerica.pdf
My guess is most cars take a big mpg hit with the AC on high though, so you're still probably coming out on top overall.
Offhand I think parking in shade, using a sun shade (ideally on the outside, but you'll probably get weird looks), and cracking the windows will help, as will window tinting.