+1 for the Dri Ducks or the similar Frog Toggs unless you plan to bushwhack. Cheap, waterproof and very breathable.

I brought a Dri Duck hooded jacket on a trip where it wasn't supposed to rain so I left my regular hardshell at home. But Mr. Murphy had other ideas and I wound up skiing in rain/wet snow for a couple of hours. That jacket performed just as well as my other more expensive shells. It just doesn't have lot of bells and whistles. But it is very light.

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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.