Nation Thailand
ONWR warns 28 provinces in five regions of floods on September 15–19
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Thailand’s Office of the National Water Resources (ONWR) has warned of waterlogging, flash floods, rapid run-off and landslides across five regions from September 15 to 19, 2026, as monsoon conditions bring more rain and heavy to very heavy downpours
Key facts
- 4/2026, reported by Bangkok Biznews, calls for the highest level of vigilance and identifies districts requiring close monitoring, alongside separate watchlists for reservoirs and rivers.
- ONWR called for close monitoring and water management at small and medium-sized reservoirs holding more than 80% of their storage capacity in 14 provinces: Chiang Mai, Chiang Rai, Phayao, Nan, Phetchabun, Tak, Uthai Thani, Chaiyaphum,
- Government targets 2031 Phuket expressway Phase 1 opening to cut trips to five minutes
- ONWR’s September 15–19 warning identifies the following districts for particular vigilance against waterlogging, flash floods, rapid run-off and landslides.
Summary
ONWR’s Notice No. 4/2026, reported by Bangkok Biznews, calls for the highest level of vigilance and identifies districts requiring close monitoring, alongside separate watchlists for reservoirs and rivers.
ONWR said a monsoon trough was extending across the lower Central region, upper South and East towards a low-pressure area over the upper Northeast. A moderate south-westerly monsoon was also covering the Andaman Sea, Thailand and the Gulf of Thailand, contributing to increased rainfall and the risk of flooding.