A strong south-westerly monsoon is forecast to bring heavy to very heavy rainfall across much of Thailand, according to the Thai Meteorological Department's forecast issued Friday, June 5, 2026. This weather system is expected to affect 60-70% of the country over the next 24 hours.
Potential Disruptions
This weather pattern will likely generate flash floods, accumulated standing water, and runoff. British residents in low-lying areas or near waterways should prepare for these conditions. Disruption to local travel and daily routines is probable. Expats are advised to monitor local weather updates and avoid unnecessary travel through affected zones.
Regional Weather Outlook
Heavy rain is anticipated across the North, including provinces such as Mae Hong Son and Chiang Mai. The western side of the Central region, covering areas like Kanchanaburi and Ratchaburi, will also see significant precipitation. On the East coast, including Chonburi and Rayong, heavy to very heavy rain is forecast across 70% of the area. The west coast of the South, encompassing Phuket, Krabi, and Phang Nga, can expect similar intense rainfall. Bangkok and its surrounding provinces also have a 60% chance of thundershowers. Some heavy downpours are predicted there.
Coastal and Marine Safety
Sea conditions in the upper Andaman Sea and upper Gulf of Thailand will be fairly rough. Waves are predicted to reach 2-3 metres. They may exceed 3 metres during thundershowers. Small boats in these regions should remain ashore for safety. Mariners are advised to navigate with caution, specifically avoiding areas prone to thunderstorms. Such conditions may impact travel plans for coastal expatriates or those using ferry services to islands.
