Oh Maxi wont go outside if it is raining. As soon as I open the door and he is about to run out on the leash, he sees the rain and turns back.

I tell him to pee quick and he does and we go inside. He has the rain coat on him yet still hates the rain.

We go outside after the rain.
I would suggest wee wee pads in your garage. That way they know they can go only there if it rains. Stay in the garage the whole time until they will pee on the pad. Sometimes you have to point where to go. Once they pee give them treats.