It is humid here too so I don't know how well it will work. I suppose I could just do it and see. Wish I lived by the ocean - minus tsunamis and hurricanes. ha
If you have a place to you could keep the mealworms in the house. I would prefer mine to be in the sunroom with all my other 'small' farm supplies but that is were it is humid. I have them in the living room at the moment but this winter they are going back into the sunroom. I don't think the US east coast has ever had a tsunami and I think the barrier islands would protect us from that, but we had a lot of roofs and a couple houses in my neighborhood lost in hurricane Irene a couple years back.