Did this hike today (July 6) at 36C. The heat was bearable until the Elk Mountain viewpoint where it's fully exposed and no shade. View at the Elk Mountain was beautiful and vast (180 degree view only, not 360), with wild flowers blooming everywhere. The hike up to here was quite tough but not undoable, you will definitely feel it at the quads. We continued our way to Mount Thurston and thought that we could relax at the Thurston peak for a lunch break - bad idea! The amount of flies (some black flies as well) was INSANE. They were everywhere and seem to be enjoying the sweat on our bodies and wouldn't go away. I'd say at any point in time we had at least 10 flies resting on us and if you stop walking for 10 seconds the amount doubles. You get numb after a while but it just wasn't a very good experience. The view at Thurston wasn't that much better than Elk either so I wouldn't recommend going there unless you need another 500 calories burnt off. All in all it's a great day hike until Elk, but not any further.