The first time I asked a girl out to play, she said it was too hot .. Is that a reason? Still don't want to date me?

If she says it's too hot, it may be a little hot, but she is largely not interested in you. If a girl likes a boy to ask her out, no matter what external conditions can stop her.

Make another appointment. Good luck. If not, it is estimated that you should be prepared for a protracted war.