Is it okay to play viola outdoors in the heat tomorrow?

Tomorrow I have the opportunity to play a gig outdoors but i’m a bit worried and wondering if I should do it or not. I would absolutely love to but not at the expense of my viola.

I would be playing in the shade and it’s supposed to be between 70-80° F (21-26° C) with 80-95% humdity. I would be out there from around 9 am to 5pm and I could play whenever I want to. It also has a decent chance to rain but i’ll be in a covered area.

Would it be okay or should I leave my viola at home?