keeping oyster mushrooms moist over the summer

This is my first venture into mushroom cultivation. I watered them regularly for the first year and kept them under the shade of a cedar tree. It's now the next summer and it usually dries out in Portland. Should I continue to water them or can i just let them go? The instructions from fungi.com didn't really indicate what to do.

They need to keep moist. Are they in logs, buckets, bags, or in the ground? Tell us about your set up.
John S
PDX OR

It's about 12 oak logs that are stacked up on the ground.  They're all about 4 ft long and 12" in diameter.  I don't have any shade or moisture cloth over them.  I water them now about once every 2 weeks and just spend a few minutes spraying them down with the hose.  I haven't seen any indication of pinning yet but I think it's too hot for them anyways.  fungi.com said the fruiting temp is 55-65F I believe.

I put a pallet and then a tarp over mine.  The pallet makes sure there is air flow and the tarp prevents dessication. Direct sun is not good.
John S
PDX OR