I spent 2 weeks up on the Naknek River area at my cabin in July - the 4th till the 18th. Weather was absolutely too nice- warm and sunny. So warm that the kings would not bite. The river's temp got up to the upper 60's and they didn't like that at all. The whole region was the same till about the 14th when the weather broke and it got more seasonably cool and rainy. But I don't go for the kings... I go for the sockeye and rainbows which were very agreeable to the warm temps.
Here's a link to my report and pics of the trip -
Here's another link to my videos -