We do a lot of outdoor gigs, but we stipulate in our contract that we need protection from sudden rain, which can happen anytime in Florida. We even got rained on when the odds were 4%.
That also gives us shade. But I found wearing sunglasses while trying to look at a computer screen complicates the matter. Some polarizing lenses block out the screen completely, others make it very, very dark with low contrast.
But you gotta adapt, play the hand you're dealt, and go with the flow. (I could go on with the clichés, but that's already too many.)

Notes