Best way to move PC audio outdoors

Anybody have a suggestion on how best to move wireless sound outdoors? I currently have two indoor systems connected wirelessly to my iMac. One uses a ROKU device with an older Proceed DAC into a Magnum Dynalab Receiver. The other uses Apple TV connected to a McIntosh 6900 integrated trough a PS Audio DAC.

I either need weatherproof powered outdoor speakers to connect to an Apple Airport Express or some sort of weatherproof cabinet.

Any ideas? Thanks