90 is too hot for good pollination, especially if the plants are very sheltered or up against a wall for example where it may easily be hotter than a reported weather temperature.
In addition to temperature, both highs and lows, there are other factors. Most notably humidity either too dry or too humid, can really affect pollination as well.
Sometimes a bit of shade will help if it’s hot. Drought to the point of wilting even fairly briefly will cause a blooming plant to drop blooms.
Spraying blooming plants with things like copper fungicides etc can cause issues as well.
I think I see the yellowing behind the browning blooms that indicates these blossoms will drop. Long story short I think 90+ degrees with suboptimal humidity for pollen was the most likely issue. Prune that whole cluster off continue to care for your plants and hopefully the next ones will set for
you.
Good luck,
KarenO
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