My jugs sit on the west side of the house. They get sun most of the afternoon into the evening (when the sun does decided to make an appearance, that is). This past Sunday the temps got up to 84, and I was stuck at work until 3pm. It was supposed to be mostly cloudy, but as luck has it, the sun came out all day. I was so worried my sprouts were going to fry. As soon as I got home I moved all of the jugs that sprouted into the shade, the rest remained where I had them. The sprouts were fine, I didn't lose any, and some of the jugs I've been waiting for to sprout have started to sprout. I didn't want to remove the tops because we're still in for some cold days, and if we get a heavy rain I don't want the rain to pummel the babies, so I'll take off the tops when the sprouts have gotten to a good size and/or we get some consistent warm days.

Karen

I have opened my sprouted milk jugs, so they were fine in Sunday's 85 degree sun. Easy to prop open by using clothes pins too, another nice advantage of gallon jugs. Lids are still attached so can be flipped closed in case of frost. Love those milk jugs.

I wouldn't want to leave sprouted containers in full sun at those temps, at least not here. Maybe much farther north, but not where I live. I'd add extra vents at the very least. Big vents, and lots of them.

Karen

Here we have intense sun and it cooks my sprouts. As such, I had much more success by leaving them in the shade until planting; and then maybe shading them until established.

Mine are always facing east and get about 6 hours of sun.
All the containers are open now, except for the ones where nothing has sprouted.