Overall, it looks like sunburn/heat scorch from a few days back, that is now in the rotting phase. I think that the wound in the center of the top pepper's large bad spot looks newer, it is some kind of insect damage most likely, I think it is secondary to your main problem.

The bottom pepper, even though the glare of the photo makes it harder to see, appears to have the more typical look of a sun/heat scorch on a green pepper, where the affected area turns an ashy looking gray-green, then yellow/tan/brown as it ages and begins to rot.

Sunscald...I have the same thing.
I pick them and cut off the scalded parts. The rest of the pepper is fine. I have some Chinese Giants that I had to pick green because of the sunscald. You can eat them green...try frying with some onions. Yummy with some Italian sausage...can you tell I used to live in Upstate NY?

I put some large plastic chairs in between my plants to help shade from the afternoon sun (from 12 pm on). It seems to be helping.

Thanks for your responses. Would it be worthwhile to drape row cover over them? That would be the most convenient thing for me to do.

Whatever you have on hand.
And best to elevate it above the plants rather than lay it on them.

I'm using a double thickness of tulle (wedding net) attached to tall stakes with clothespins. The cover has been on through the heat wave, and it's working great. No sunscald on Vidi or Valencia, and good production of new leaves and peppers. The cover is about 18 inches above the foliage, so it only filters the midday sun.

I keep a close eye on the daytime temps, and put up a white sheet when the temps go over 90. The peppers still get some light, but it blocks the worst of it. This has worked well for the past three years. I have 24 plants in the garden this year.

Thanks SORTA! Mine were looking wilted in 90 degree sunny day today so I watered and put the white sheet up. An old fitted twin sheet hugs onto the fencing I have on my 4x4 foot square bed. Read this just in time, I think!

This is blossom end rot. I have this on several of my red bell peppers as well.

I use shade cloth purchased from HD. It gets a lot of usage because 90+ is the summer norm in southern California. The key thing is to provide enough headroom for air.
{{gwi:84306}}

Looks like regular sunscald to me and not blossom end rot. Shading it will help for this year but like pennypond said you want to have enough air circulation around the plants.

For next year, I find that peppers are best planted shoulder to shoulder so they all shade each others' fruits. I plant mine 8 inches apart at most.