google "plant nutrient deficiency" and look at the pics. Some of those leaf symptoms are classics.Â
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The rain is either washing the nutes out of the nice, well-draining potting mix, or the wet mix is preventing take-up. Other than trying to keep them dry (even at the cost of full sun for a while), use a general purpose fertilizer. I use MG All Purpose, though I'll probably be flamed for saying so here. It's got a little bit of everything (almost) in the right proportions and it's cheap, though you may choose to spot-treat the symptoms once particular deficiencies are identified.
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Good luck!