I would say add a little more water than usual, till the pot is heavy. The hotter it is, the more your plant will drink. If you had a friend watering while you were gone, they probably had no idea what to do. Now that it's hotter though, you will probably have to change your watering from every 3-4 days, down to every 2-3 days, whenever the pot feels light. Like Captain is saying, you may want to add more perlite to your soil as well. The pistils usually start to change after week 4 from what I've noticed, this is completely normal. If you're doing an outdoor grow, there's not a lot you can do for temperature except maybe find something to shade it a little. You want as much sun getting through as possible still so something almost like a thick screen might work. Not really sure how else to help that honestly. Your plant should bounce back pretty quickly if you resolve the issues, maybe a few days. If it gets worse then there's probably something else going on too. If you have something for the roots (like Hydroguard or similar) it should help your plant to be able to handle a little hotter temperature than normal. Hope that helps