Turn-out with no shade/tons of flies-Is this safe?

We have trees but the shade is gone at around 11am and they have sprinklers hitting their pens...do they stand in the shade when they have it or the water? No...occasionally I will catch Polly under the sprinkler but the others would rather stand in the 100+ weather. They are happy and content in their pens....
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If it's like the Portland area (where I am) I wouldn't worry about it- it's not all that hot or humid here. You might talk with your BO to establish under what weather conditions you want your horse kept inside (i.e. During the hottest part of the day when 90' or higher) and ask if they'd be willing to build a run-in or other shelter in the pasture.

For the flies, fly spray and a long fly mask would be improvements. You can even spray the fly mask with fly spray (let it dry before putting it on the horse, though). If your horse's face is dark, then a light colored fly mask might actually be cooler for her (same with a light colored fly sheet).

The turnout schedule should be reversed that the horses are out during the night and in during the day. Slather vaseline where the flies are converging plus check up by her teats. I'll bet that whole area is scabby and needs lots of vaseline. The bugs hate greasy. Flies have been netted at 5000' so those from a cattle yard in California can ride the prevailings and wind up thousands of miles away. What I don't like about fly masks is that the bugs can get in the gap between the jaw bones. They do offer considerable protection from eye flies tho.

Sometimes I think they're smarter than we think when it comes to what is safe. Even with a lot of trees and a sturdy shelter, when we get hurricane rain, wind, or hail here in NC, our mares are out in the pasture, packed together in a close bunch, heads down, and butts into the wind/rain/hail. The minute the rain stops in between bands of rain, they're back to grazing like nothing happened.