August 1st – 18th: Kodaiji Temple Summer Illumination (sunset – 21:30)
Place: Kodaiji Temple. The nearest station is Gion Shijo (Keihan).
Fee: 600 yen
August 3rd – 12th: Kyoto Star Festival (19:00 – 21:30)
Place: Horikawa street – the nearest station is Nijojomae (subway Tozai). Kamogawa river – the nearest station is kawaramachi (Hankyu) or Gion Shijo (Keihan).
August 14th – 16th: Kiyomizudera Temple Summer Illumination (19:00 – 21:30)
Place: Kiyomizudera Temple. The nearest station is Kiyomiuzu Gojo (Keihan).
Fee: 400 yen
August 16th: Arashiyama Lantern Floating Event (19 – 21)
Place: Togetsukyo (Arashiyama). The nearest station is Saga Arashiyama (JR Saga), Arashiyama (Randen) or Arashiyama (Hankyu).
Fee: Free (1000 yen for one floating lantern)
August 16th: Gozan Okuribi (Five Bonfires) (20:00 – 20:45)
For details, please check my post about this event.