Questions about onion curing.

I've read that the ideal temps for curing onions is 75f-85f but how much wiggle room is there? Day temps for me are getting to the high 90s low 100s and night time is getting down to the low 60s will these swings in temperature ruin curing?

Do they need to be isolated from sunlight? I've seen some people say to keep them out of direct sunlight but is that a requirement or just a "works best if you can avoid sunlight"?