Starting our Camino on May 6. Super excited! These forums have been awesome! Doing Coastal Portuguese from Porto with my daughter and her girlfriend. Definitely packing good lightweight rain jacket, but on the fence with rain pants. I'm probably in quick dry hiking shorts most of time based on the weather forecast, so my gut tells me I won't need the rain pants as will dry fairly quickly unless we get a downpour or hours of rain. Thoughts?
Several years ago, my daughter and I hiked the Portuguese from Porto, via the coastal for a few days, about the same time of year you'll be going.
Took rain pants and tried to use them a few times.
The problem was that by the time we stopped to get them out of our bags, put them on, and walk a bit, it would stop raining and the pants would be like a mini-sauna, so we'd have to stop again, take them off, put them back in our pack and then continue, and shortly, just about when our pants would dry out, the rain would start again.
The point is, with intermittent rain showers in the spring, there has to be a better way. Either don't use the rain pants, as you plan, or use something much more breathable and manageable like a rain kilt.
For different seasons, when you might encounter hail, snow, sleet, etc., you might be wise to have the extra warmth layer of rain pants, or in other seasons when you expect to encounter high winds and sustained rains.