First grow in extreme HOT weather 43°C !

This is my First ever grow, the weather conditions for outside temperature atm around here in June are 43 high and drops to 28 low at night and will remain the same for around 10 weeks from now while the humidity is 9-12%, so it's quite challenging. Therefore, am planing to grow most of the plants indoors and will transplant some outdoors after few weeks when they get stronger. For Temp. control i use an air conditioner and a humidifier which cools the hole room the the closed is in amazingly, i'm only concerned of the big Temp. fluctuation which happens sometimes when give the conditioner a rest. inside weather conditions are: Temp > 26 C Humidity > 24% (45% when the closed is closed which is most of the time) Week comment: little side new leafs are showing, looking great to me apart from the brown dot on cotyledon.