Kyoto sits in a basin and holds the heat — late June runs 26–31°C, humid, with the rainy season still trailing off (which is exactly why Mimuroto-ji's hydrangeas are at their peak). Carry a fold-up umbrella, a hat, and water; the dawn Fushimi start is partly to dodge the worst afternoon heat. Temples mean a lot of stone steps — comfortable shoes.
A friend's bar picks · plus yukata shops to try (central, a short hop from the Moxy & by Pontochō)