well, since in April rain (and depending on location, even snow) is probably possible to probable on all routes (and on some routes inevitable and daily) I would say make sure you have some sort of rain gear and tested it. There is much debate poncho vs jacket (pro's poncho, can take it off without removing pack, cons--wind can blow it; jacket pro's--can be used just as a jacket, or to wear while washing everything else...cons, have to take off pack to remove, and will need a pack cover). in either case (I liked my jacket, and got a dayglo bright pack cover to aid visibility in poor weather ) i suggest a light weight ball cap (I took one of my runners caps) to wear under the hood of poncho or jacket...neither is as good for keeping rain out of your face as a ball cap--this was one of my surprise favorite most used items). then pants vs gaiters (pros gaiters--not as warm--not a pro to me, but to many, cons the rest of your legs will get wet; pants-pros for me, warm, and you can wear while washing everything else, cons...some think they are too warm); then there is waterproof vs non water proof boot/shoes...the debate is endless...I chose waterproof because I was walking very wet routes in april but there are endless pros and cons to each. I also appreciate the extra warmth of gortex in shoes and clothes in April...i tend to be cold. I would read though as many debates on all of these as you can tolerate, look at precipitation predicted for your route, then test your gear in the rain this winter (or if need be, a shower or under a sprinkler)...test test test for how comfortable you are wet-wise, temp-wise, etc if possible by walking in the rain. Make sure you love your wet weather gear long before you get on the airplane.
Buen Camino!
