Please dip them into a somen soup.
It is cold and good under the humid weather.
In northern Kyoto, the place called Kifune is very popular for Kawadoko or the floors over the river, among Japanese people. Kifune is located in the north. And the temperature is a little lower than in the center of the city.
Usually you can enjoy the typical Kyoto cuisine on the floor. But it cost a little high.
The restaurant, Hirobun, offers this Nagashi Somen noodles in reasonable place.
This is the one of the way to enjoy this hot summer in Kyoto
the nearest station : Kifune
From there, take a bus or walk.
To have Nagashi -soen, you may have to wait .
I recommend you to go a little earlier like 11 AM