Pipe smoking in the rain, under open-shelter, is the best kind of pipe smoking. Or at least, it's one of the best kinds.
I don't mean if the wind is blowing. Best to smoke indoors in that case. But I mean, if it's a calm and steady sort of rain -- the pensive sort that you don't mind going to bed to -- well then, I pull up a chair under the front awning so that the rain is falling on 3 sides of me, light some latakia, open a good book, and maybe watch a leaf navigate a gutter-fed rivulet whilst listening for the splash of occasional cars hitting puddles in a sleepy town.
Those are the memorable smokes.