Bigcountry,
You should be okay on storage of your guns. I assume you keep your home at a comfortable temp. 68-78F. Short periods of high humidity like rainy spring days shouldn't cause your guns to rust. We have about the same climate conditions where I live.
Like I said in my earlied post A/C does a good job of removing moisture from the air. If you don't use A/C you might want to invest in a dehumidifier or some type of dessicant for your safe.

Rem. 222