The plants are on a covered porch receiving afternoon sunlight until dusk. They have grown and bloomed vigourously. I see no signs of bugs, mites, mealy bugs, or scale.

I planned to bring them indoors for the winter months. Might it just be stress enduced?

The sunlight they were receiving was quite intense and they were sitting in water when i got back from vacation. My neighbor had overwatered them so they had lost some roots to rot. They dwindled for about a month before regaining full vigor.

I didnt think much of the spots until recently. I hope it's not a virus of some sort. Some of the newer leaves have spots too but the most vigourous branches are free of them.