This Saturday marks the first day of Thailand’s rainy season

Stock photo via Flickr

Saturday, May 15, Thailand will mark the official start of the 2021 rainy season, with 5 to 10% more rainfall expected compared to last year. The Thai Meteorological Department says the first half of the rainy season, from now until July, the total amount of rain is expected to be 10% more than the average, while the second half of the season will see rainfall at the average rate.

The actual timing of the annual wet season varies across the country.

More about Thailand’s wet seasons HERE.

The Eastern and South western parts of Thailand are expected to see heavy rain to very heavy rain in some areas. The expectation is due to the southwest monsoon increasing in its strength temporarily, while prevailing over the Andaman Sea.

When tropical cyclones (typhoons) move near or past Thailand, gusty winds with heavy to very heavy rains is to be expected in many areas. Gusty winds will cause waves that could reach 3-4 metres high in coastal areas. The Department is warning the public and mariners to monitor the news during cyclone periods. Heavy to very heavy nonstop raining may occur for many areas of the country. Flash floods are expected, especially from August to September.

About 1 month ago, the Department announced that the upcoming monsoon season is expected to see the highest amount of rainfall in 30 years. The Royal Irrigation Department had instructed agencies to prepare for the situation by inspecting reservoirs’ and irrigation buildings’ conditions.

As of April 2, Thailand’s water catchments were 50% full. The country overall had used a total of 73% of the water in the management plan. The 4 main dams on the Chao Phraya River were 38% full, with about 2,748 million cubic metres of usable water. Last year’s water management during the dry season had followed expectations, leaving enough available water until the end of this year’s dry season.

SOURCE: Thai PBS World

Join the conversation and have your say on Thailand news published on The Thaiger.

Thaiger Talk is our new Thaiger Community where you can join the discussion on everything happening in Thailand right now.

Please note that articles are not posted to the forum instantly and can take up to 20 min before being visible. Click for more information and the Thaiger Talk Guidelines.

Ann Carter

Ann Carter is an award-winning journalist from the United States with over 12 years experience in print and broadcast news. Her work has been featured in America, China and Thailand as she has worked internationally at major news stations as a writer and producer. Carter graduated from the Walter Williams Missouri School of Journalism in the USA.


  1. Fear mongering!

    What the rain does, is freshen up the air, gives tropical forests its power and let’s hope farmers will have a great season! That it is physically possible to see how full/empty a reservoir is [should be] a no brainer.

    But to scare people to think that [Thai] meteorologists has the knowledge to predict weather “About 1 month ago, the Department announced that the upcoming monsoon season is expected to see the highest amount of rainfall in 30 years.” Is awful!

    Well, with the knowledge history has given, they can predict the monsoon season is coming [of course] and by compare the reservoirs from year to year, understanding there’s been a lot more free volume in the preceding years and to come up with the conclusion that, it doesn’t look good!

    Its absolutely possible, although that has nothing to do with prediction the weather but with miss management of the reservoirs, sewers, its outflow and what not.

Leave a Reply