Phals turning yellow
 

Hello!!

Recently it has gotten extremely hot where i live, around 40 C and just now i noticed 3 of my phals turning yellow with brow splashes.
Is this sunburn? Or should I be worried about a fungus?
🙏🏼 Thank you in advance for any advice 🙏🏼

I would worry about sunburn. Phals are low-light plants. If they get a blast of direct sun (even for a few minute) they can get leaf damage. The leaves look quite pale even where they aren't yellow. I would suggest moving them to much lower light.

They do not need direct sun ever.