General Situation
30 May 2026
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Weather Map
The rather strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf while the monsoon trough lies across the North, the upper Central and the lower Northeast into the low-pressure cell over the coast of middle Vietnam with heavy rain in the country and isolated very heavy rains are possible in the North, the Central and the South regions (west coast). People in Thailand should beware of heavy to very heavy rains and its accumulation that may cause flash flood and overflows, especially along foothills near waterways and lowlands.
The rather strong wind forces the waves in the upper Andaman Sea from Phuket northward up to be 2–3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea from Krabi downward, the waves are expected about 2 meters high, 1-2 meters high in the upper Gulf and above 2 meters high in thundershowers. All ships should proceed with caution and keep off thundershowers, small boats in the upper Andaman Sea keep ashore.
Bangkok Metropolis and Vicinity Forecast
06:00 Today - 06:00 TomorrowScattered thundershowers and isolated heavy rain. Minimum temperature 26-27 °C. Maximum temperature 34-37 °C. Southwesterly winds 10-25 km./hr.
Announcement Date 30 May 2026
Weather Province Additional
7 days Weather Forecast
During 29 May – 4 Jun 2026Forecast
During 29 - 31 May 2026, the rather strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf with the monsoon through will lie across the upper country. Continuous rains and isolated heavy rains are likely in the country. During 1 – 4 Jun 2026, the rather strong southwest monsoon still prevails over the Andaman Sea, Thailand and the Gulf and the low pressure cell cover the upper bay of Bangal and Myanmar. Less rains but isolated heavy rains present in the upper country while isolated heavy to very heavy rains are likely in the South and the East. The rather strong winds and waves in the upper Andaman Sea throughout the period. The waves in the upper Andaman Sea are expected 2 - 3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea and the upper Gulf are about 2 meters high and above 2 meters high in thundershowers.
Caution
People in the country should beware of heavy rains and accumulation that may cause flash floods and overflows especially along the waterways near foothills and lowlands. All ships in the Gulf and the Andaman Sea should proceed with caution and keep off thundershowers throughout the period. Small boat in the upper Andaman Sea should keep ashore during 29 May – 4 Jun 2026.
Announcement Date 29 May 2026
7 day Weather Summary
22 May 2026 - 28 May 2026Forecast
The moderate southwest monsoon which prevailed over the Andaman Sea, Thailand and the Gulf of Thailand strengthened on the last day of the period. In addition, the low-pressure cell covered upper Vietnam almost the period and the southerly and southeasterly winds blew over upper Thailand at the beginning of the period. These conditions caused rainfall in upper Thailand almost the entire period with plentiful rainfall occurring on the first and the last days of the period. Gusty wind, flash flood and landslide were reported in some areas. in the southern region, abundant rainfall was observed mainly along the west coast.
Announcement Date 29 May 2026
Previous
Monthly Weather Forecast
November 2022Forecast
Upper Thailand will be more cold especially the northern and northeastern regions with some thunderstorms on certain days. For the mountain tops, mountain peaks, and mountain ranges, the weather is generally cold. This is because The high pressure area from China will extend to cover the North and Northeast periodically. It will be mostly moderate power. the southern part It continues to rain heavily. especially the east coast from Chumphon down There are still thunderstorms in 60 - 80 percent of the area with heavy rain in many areas and very heavy in some places.This will cause flash floods and flash floods, as well as overflowing riverbanks in some places. For wind waves in the Gulf of Thailand will be strong. In some periods, there will be waves 2 - 4 meters high, while the Andaman Sea will have 1-2 meters high because the northeast monsoon still prevails over the Gulf of Thailand and the South. It will have strength from time to time. In addition, there will be a monsoon trough that lies across the central South in some periods. In addition, in some periods there will be an active low pressure cell moving closer. and has a high chance of moving through the southern region
Caution
In summary, this month, the total rainfall in the northern and northeastern regions is expected to be 10% less than normal, and the central and eastern regions are close to normal. The southern region is 10 percent above normal, while the average landscape is still slightly above normal.
Announcement Date 01 November 2022