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The Thai Meteorological Department (TMD) has officially proclaimed that the start of the rainy season in Thailand has arrived on Friday, 15 May 2026. With monsoon weather usually arriving, visitors this year planning beach getaways and trips to islands will be concerned.
Weather experts forecast a 10-20% below normal seasonal rainfall in Thailand. Authorities believe a drier pattern of weather may occur in the remainder of the year with fewer big storms due to changing climate and the potential return of the El Niño phenomenon.
But the traveler can be deceived when choosing from the less rain option during the early weeks of the season during which it might actually be raining.
Weather experts say that with the onset of El Niño, weather patterns are likely to be affected in the second half of 2026 and will have an impact on the number of precipitation that will reach the Balochistan province. Under El Niño conditions, dry conditions are observed in areas of Southeast Asia and higher average temperature.
The Thai Meteorological Department also predicts a brief, dry spell, from the end of June into early July. At this time, the frequency of precipitation is likely to be significantly reduced prior to the return of stronger monsoons around August of this year.
The other key factor this year will be storm activity. Meteorologists estimate that one to two tropical storms will directly affect Thailand in the heaviest rain period of the year, August to September.
The scanty rainfall projection, which spanned several years, has been realised this season with torrential rains in many parts of the country.The rainy season has started with heavy rainfall despite the long-term forecasts of lesser rainfall. The authorities are expecting a large amount of rainfall in nearly 70% of the Nation in the first weekend of the season with heavy to very heavy rainfall.
Flash flood alerts are already in effect for several areas in northern, central, eastern and southern Thailand. Low-lying areas or mountain provinces are being warned travelers to please keep watching local weather updates.
Heavy seas are also threatening coastal areas on the Andaman Sea side with waves up to three metres. Small boats and ferry operators are urged to “take extra precautions until May 18.
The rainy season is forecasted to resume from around mid-October into upper Thailand such as Chiang Ma, and Bangkok. The rain is usually short bursts in the afternoon and nice clear nights in most rainfall areas.
The weather in Bangkok is likely to have a high level of humidity from the beginning of the season. Sometimes the rain may cause some streets to flood; however, people continue to come and go during this time thanks to a number of indoor options such as shopping malls, cafes and indoor attractions which can provide shelter during the flash floods.
Ferries and island tours can sometimes be affected by rougher seas in the areas on the Andaman Coast, such as Phuket and Krabi. The islands in the Gulf are, as a general rule, drier for longer and may offer more ideal beach holidays later this year instead of Koh Samui and Koh Phangan.
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For travellers coming to Thailand in the rainy season, the activities and fun one can have outside should be arranged as early in the day as possible as rain storms tend to occur during late afternoon. Most mornings are sunny, ideal for sightseeing, visiting temples and excursions on the islands.
Insoles, feet boots are also very advised. Much of the time in populated cities, after a sudden, unexpected rain, the streets tend to fill up rapidly, requiring others to switch to sandals or shoes that dry faster rather than sneakers.
Weather radar applications are also very useful to many tourists as they are able to follow weather activity in real-time. Local forecasts are available and are frequently updated every hour; giving travelers the chance to avoid seeing unforecasted heavy rain.
The rainy season is a favorite time of year for many people to visit Thailand. People are not as crowded, hotel rates are lower and the scenery is greener and more colourful when it rains.
Rain showers are also typically brief in comparison to what many visitors would expect. Thailand’s monsoon is not the all-day kind of storm, but rather can be a day of sunshine for most of the day and then a short, sharp downpour in the afternoon.
With proper planning and with flexible timings, one can enjoy the beaches, the temples, the nightlife and the cultural activities throughout the season.
The Thailand Meteorological Department has confirmed that the rainy season starts from 15 May 2026 for Thailand.
The heaviest rains are during the peak period (August to September).
Yes, there are still plenty of tourists visiting Thailand during the rainy season but keep in mind that weather conditions in Thailand can change rapidly and unexpected flooding can occur.
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