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Use a good crusting BC or fondant. Avoid perishable icings/fillings. I always required the cake be under a canopy of some kind ..... deck, porch, tent. (Actually food being under a covering is a HD requirement around here, so it was easy to "demand" that.)
My icing holds up well in extreme outdoor heat. 90+ degrees, SUPER high humidity, never had a melting problem.
I had one bride who asked "Can I have the whole cake iced in cream cheese icing?" to which I told her, "Not for an August outdoor wedding you can't." 
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