i was going to answer this with the meme "you dont say?" but looks like your asking a serious question and my answer is yes if its humid it hard to sweat it out so your body is hotter than usual which makes your muscles more tired and fatigued . If its hot just drink a lot of water and youre good
Intellectuals solve problems, Geniuses prevent them
RAFA2005RG- "If he (Rafa) lost Roland Garros it would be like death."