The Thai Meteorological Department forecasts 60% chance of thunderstorms in the East, North, Northeast and southern coasts on 4 August 2026, with very heavy rain in Nakhon Nayok and Trat and flash-flood risk in low-lying areas. Andaman Sea waves reach 2-3 metres, and small boats in the upper Andaman should stay ashore. If you run deliveries, outdoor work, or boat tours in these areas, shift schedules to mornings and allow for delays. Keep stock and equipment off the floor in flood-prone spots.