Mt Hiei
https://gyazo.com/c964378ccdc5be9c88489962fc841710
N35.0688964,E135.8417719,Z16
It is usually a little cooler at the top than the valley where Kyoto sits, so it can be a good place to escape some of the summer heat.
It's good to check in advance if the eizan line, cable car, and ropeway are in operation as the may be closed for maintenance or repairs after a typhoon, etc.
To get to Mt. Hiei there are a few options but the most scenic and popular choice takes about 1-1.5 hours and is as follows:
ben.icon Technically it is a funicular style. It provides some very nice views across Kyoto. At the small station, switch to the Hiei ropeway for the last short ascent to the top.
Notes
Alternately, you can enjoy hiking some or all of the route up the mountain, depending on weather conditions and season.