The longest we had without rain was about a week, but I picked a nice place so its not a worry. I have one that started budding about two weeks ago and the rest are just starting.I am in your neck of the woods, just south a state. Most of my plants are heavy into flower, and I have switched from "Advance Nutrients, Big Bud" to Fox Farm, Open Sesame, Beastie Bloom, Cha Ching. So far they seem to be doing ok. I did slack on the Nitro thow, so I am also once and a while adding some fish Emulsion. We have been having a super hot summer, and where I am at noooooooo rain. But givin the choice I would prefer no rain to too much rain.