Anybody from south Texas?

Can anybody please help me? My Babies went in to flowering two weeks ago and now the top fan leaves are now showing signs of heat stress. They are in direct sunlight from 6 to 6, and have always been. Why are they barely showing signs of stress?
What should I do?

outdoors right now? it too cold.
You should go buy a grow light & fans.
Or keep it covered at night. could have cell damage for the freeze last night.

If you're sure it's heat stress try to shade them in the afternoon if you can. It's been getting cold then hot then cold over and over here, maybe that'll make them stress a little, just brainstorming, really don't know.