What do you mean hot weather can't stop happiness?

This means that you can still be happy in hot weather.

"Hot weather can't stop happiness" means that no matter how hot the weather is, we can still maintain a happy and positive mood, which is not affected by external difficulties and discomfort. This sentence conveys an optimistic, strong and adaptable spirit, and encourages people to keep a positive attitude, enjoy life and find happiness when facing difficulties and challenges.