I am 11 and I am having a lemonade stand today with me friend. (But it is lashing rain) :( But I don't know if people will come, or think it's strange or what!

Good luck with that.
I assume this is outside your own house, if not your going to need a whole heap of permits and the like..

Thanks we made 25 euro but you didn't excactly answer my question.

Lashing rain is not good for lemonade stands. Hot, sunny weather is, so time your stand to be open during weather when people want refreshment and a cool drink. Good luck!