Inthanon National Park has temporarily closed the Pha Dok Siao nature trail and Mae Ya waterfall after rain built up water on the site. The Meteorological Centre expects heavy, intermittent rain on 28-29 September 2026, with flash floods and landslide risk at night in Om Koi and Chom Thong. If your business runs tours, homestays, or restaurants in these areas, move bookings and stock to higher ground, plan for cancellations, and check the park's Facebook page before reopening.