Swim shorts, t- shirt and sandals. Wear a paddle jacket in the morning or if it is cloudy, or you are in a kayak getting wet all the time. An extra layer of polypropylene is good to key in a day dry bag. The water will be refreshing but not bitterly cold unless we have a huge snowpack in idaho.
Raft = shorts & T-shirt with layers and rain gear handy.
Ducky = Splash wear with layers, NRS Hydroskin, or shorty wetsuit, especially if you tend to be cold or anticipate a lot of "out of ducky" experiences.
Camp = Mostly warm weather stuff, swimsuits, but have some layering pieces, and good rain gear. July is usually pleasantly hot to blazing hot, but you never know. One year we had a rainy & cool August trip. Make sure your group has a good shade & rain tarp, big enough for the group to hang out under. Many of the camps, especially river right, have no shade.
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