Your appetite might be low due to the hotness and humidity. Then noodles with cold soups are for you.
Cold ramen, also called hiyashi chuka in the Japanese language, is served with toppings that can be sliced cucumbers, hams, fried eggs and tomatoes. The popular sauce is soy sauce based, followed by sesami flavoured one.
Cold ramen cooked by the author
Other options are cold soba and udon. Soba can be hard to be seen in Kyoto and expensive, but is my favourite noodle. You can find cheap udon restaurants in town.
Enjoy touring around Kyoto in the summer with nice cold noodles.