THC will degrade in light, so you should hang it in a dark place with adequate air circulation. If you have an outdoor place that can accomplish these needs, go for it. There's no "guarantee of mold", but the potential is there. Therefore the need to keep the air moving and the humidity low.
Weed can be dry'd out door. I grow in the hills and dry in bud camp! its in the shade of the redwoods! As long as there is no rain in the forcast it take 5 days hanging in the shade! then i clip the buds off branches and place the buds in a paper bag and cap the bag with a second paper bag so now the bag has a top. so the bags can be turned with out ever touching buds! just flip the bag over! i have done this with a few hundred pounds of buds dryed outside with out EVER 1 moldy BUD Yet!
This is a very old post... but still... someone says that you can not do drying outside... Hog wash! Where do you think the major large growers do drying in the parks? Or the pacific north west forests ? or in Mexico ?