Any idea why? My wife did not water them during my absence because of heavy rains at night during my trip.

Since it's gable end, I don't think the pots got soaked - have you checked the soil? They might have gotten less water than she thought being right against the house like that, though I don't see leaves wilting or rolling in your closeups.

They're obviously getting enough sun, but wondering what direction that side of the house faces, how many hours of sun? Have you grown in that location before? How hot did it get while you were gone?

While the plants look great, a light-colored house, the concrete and brick nearby (though low), and a southern exposure plus high temperatures (?) could be contributing to blossom drop and if that's the case, it could get worse as the summer goes on.

Need more info please, but since I do see fruit set and the plants look healthy I wouldn't worry about those flowers right now. Oh, but last picture, I do see some yellow leaves maybe spotted - check for disease starting with all that rain - you may need to remove some foliage and spray fungicide.

And what can happen is that if the newest blossoms are still not fully open,they can turn blackish and drop, just due to being rotten. Nothing to do with high sustained heat or humidity, which are the usual reasons for traditional blossom drop.

Does that make sense to you?( smile)

Carolyn

Sure the plants benefit some just from the increased moisture in the air but the soil in the containers still requires actual watering most of the time even after a heavy rainfall.

Dave