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Between 24 and 26 September 2026, Bangkok experienced one of its most severe rainfall events in decades. A slow-moving low-pressure system along the monsoon trough produced nearly continuous heavy rain, with many districts receiving close to 300 mm in about 48 hours and some locations exceeding 300 mm. The deluge overwhelmed the city's drainage and canal network, causing widespread flooding, major transport disruption, and inundation of homes and businesses. Authorities declared all 50 districts disaster areas, opened hundreds of emergency shelters, and operated pumping stations at full capacity. Around the same time, the Dawei district in Myanmar was also hit by flooding.
2. Analyses and Observations
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The plot below shows the evolution of the forecasts for 3-day precipitation (24-26 September) for Bangkok.
The plot below shows the forecast evolution for 3-day precipitation in the Dawei district in Myanmar (0..5x0.5 box centred on 14.0N, 98.2E).
3.4 Sub-seasonal forecasts
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