Well, I don't really have problems with heat as long as it was not a crazy abnormal heatwave that can even impede normal outdoor activities. I think I am used to hot weather and I can't really relate with people who are impaired by heat. It is way crazy for me to bike in the winter because my body will feel really hard. For sunlight, I never really had any problems either but I guess I need to be careful about the negative effects of direct sunlight and start putting on sunblocks.