A historic temple on Khlong Sanam Chai in southwest Thonburi, dating back to the Ayutthaya period, with barely any tourist presence.
Wat Sai sits along Khlong Sanam Chai in Bangkok's Thonburi district — its original ordination hall (ubosot) dates to 1703, during the Ayutthaya period, though it was substantially restored in the 19th century. A newer, larger ubosot with a distinctive blue-tiled roof was built alongside the old one in 2003 to mark the original hall's 300th anniversary.
The temple once anchored Talat Nam Wat Sai, a genuine floating market on the canal — the market itself has largely moved onshore, but the canal remains active, and boatmen at the pier can still be hired for a quieter, far less touristy version of the canal-boat experience than Damnoen Saduak or Amphawa offer.
Wat Sai sits in southwest Bangkok, away from the usual Old City temple circuit — reachable by boat, taxi, or Grab; it's a genuine detour rather than something to combine casually with a Grand Palace day, which is exactly why it stays quiet.
Visitors who've already covered Bangkok's major temples and want a working, lived-in religious site rather than another stop on the well-worn tourist circuit — bring modest dress as at any temple, and expect to be one of very few non-Thai visitors there.
