I have to go even if it rains.
Make haste in out of the wet.
It started raining on the way, but this is to be expected.
As soon as the rain is over, let's go out.
It looks as if it were going to rain.
It looks like it'll rain.
At any rate I will go out when it stops raining.
Let's go as soon as it stops raining.
At any rate, I can go out when it stops raining.