Preparing for Thailand's Rainy Season, Heavy Rains, and Floods: Drinking Water Reserves and Daily Life Measures Guide [For Residents]

The rainy season is one of the seasons that always concerns me when living in Thailand.
Especially in urban areas, including Bangkok, heavy short-term rains, road flooding, and traffic jams can be common topics.
In some regions, there may be floods and temporary impacts on daily infrastructure, so being prepared in advance brings peace of mind to residents.
This time, we will provide an easy-to-understand explanation of drinking water stockpiling and daily life measures to prepare for Thailand's rainy, heavy rain, and flood season.

When is the rainy season in Thailand? What are its effects?
While there are regional differences, Thailand's rainy season is generally observed from around May to October.
During this period,
- short, heavy downpours
- road flooding
- prolonged traffic jams
- delivery delays
- and sometimes power outages or water supply interruptions
can affect daily life.
First-time residents in Thailand, in particular, may find the impact on their daily routines to be greater than expected.

Drinking water is the first thing to prepare for during the rainy season/flood.
On days with heavy rain or when travel is difficult, it may not be possible to go shopping.
Therefore, drinking water is the top priority for preparation.
Generally, some households prepare about 2-3L per person per day as a guide.
For example,
- 2L bottles: for home storage
- 500ml bottles: for carrying out/going out
It is convenient to prepare them according to their intended use.

Why is drinking water important to stock during the rainy season?
During the rainy season in Thailand, the following situations can occur:
- Delivery delays make it difficult to receive orders.
- It is difficult to go out.
- Convenience store products may temporarily decrease.
- It is difficult to go shopping during a power outage.
In other words, the problem isn't that water "isn't sold," but rather that it's difficult to get to or have it delivered.
Therefore, rotating stock by always having a little extra on hand is effective.

Heavy Rain Countermeasures to Consider for Life in Bangkok
In Bangkok, road conditions can change rapidly due to short, heavy downpours.
Therefore,
- check the weather forecast before returning home
- carry drinking water when going out
- prepare a mobile battery
- stock a small amount of food and daily necessities
- avoid unnecessary travel
Such small daily preparations can be helpful.
Life Stockpile List Useful During Floods and Power Outages
Along with drinking water, the following preparations are also recommended:
- Emergency food/shelf-stable food
- Mobile battery
- Flashlight
- Wet wipes
- Portable toilet supplies
- Regular medications
- Small amount of cash
The list primarily includes items that are easy to prepare even for condominium living.

How to stockpile the water you normally drink
In addition to having separate emergency water, it's also practical to keep a little extra of the water you normally drink.
By refilling as you use it, you can more easily prevent it from expiring.
Even in Thailand, for those who:
- want to be particular about their daily drinking water
- want to choose Japanese quality water
- want a sense of security during emergencies
ONSENSUI99 is chosen by such people.
It is natural alkaline hot spring water sourced from deep underground in Tarumizu, Kagoshima Prefecture.
With a hardness of 1.7, it is ultra-soft water characterized by a gentle and mellow taste.
It is a versatile bottle that can be easily incorporated into both daily use and emergency stock.

Measures to take if you encounter the rainy season while traveling in Thailand
Those visiting Thailand for travel may also encounter the rainy season.
In such cases,
- carry drinking water
- a folding umbrella for sudden rain
- allow plenty of time for travel
- finish shopping around the hotel in advance
It is reassuring to be mindful of these things.
Frequently Asked Questions (FAQ)
Does it rain all day, every day, during Thailand's rainy season?
Depending on the region and time of year, it's often a case of short, intense downpours rather than rain falling continuously all day.
Is it necessary to stockpile water during floods?
Movement and shopping can become difficult, so having a drinking water stockpile brings peace of mind.
Is it necessary to stockpile even if I live in a condominium?
Even in urban areas, delivery delays and power outages can occur, so it's recommended to have at least basic provisions.
Related Articles
▶ How to prepare for power outages and water supply interruptions in Thailand?
▶ PM2.5 countermeasures in Thailand | Dry throat and hydration
▶ Is water in Thailand safe? Explanation for Japanese residents
▶ About ONSENSUI99
▶ Product page is here
Summary
During Thailand's rainy, heavy rain, and flood season, advance preparation can significantly increase your peace of mind.
Specifically,
- stocking drinking water
- mobile charging
- food stockpiling
- travel planning
- weather checks
Paying attention to these points can help minimize the impact on your daily life.
For those who want to use their daily drinking water for stockpiling, ONSENSUI99 is also an option.
Start preparing now to make your life in Thailand more comfortable.

