Bangkok Rainy Season: What Nobody Tells You
Bangkok rainy season runs May to October. Flash flooding, Grab surges, and delivery delays are real. Here is what living through it actually looks like.
Bangkok Rainy Season
Rainy season in Bangkok runs May through October. It is not all-day grey drizzle. The pattern is: hot and humid morning, then a heavy downpour in the afternoon or evening, then it clears up. Most people who live here manage it fine. Here is what to actually expect.
When is rainy season?
May through October. September and October are the wettest months, regularly topping 180 to 260mm per month. May is the transition, when the first rains arrive unpredictably. By November it is mostly over, though late showers still happen.
The rest of the year is Bangkok’s dry season. November through April is either cool and pleasant or hot and dusty, and coincides with the burning season (January to April) when farmers in northern Thailand and Myanmar burn crop fields and air quality takes a hit.
Daily rainfall in Bangkok, 2025. Source: Open-Meteo archive API.
What does rain actually look like day to day?
Mornings are usually clear and hot. The rain builds during the afternoon heat and hits between roughly 2pm and 8pm. A downpour lasts 30 to 90 minutes. After that, it clears up and the night is fine.
September and October are different. You get sustained, heavier rain that can last hours or most of the day. Street flooding becomes a real concern during those months.
Bangkok Total Rainfall by Month (2025, mm)
Source: Open-Meteo archive API. Daily precipitation totals aggregated by month.
Flash flooding: how bad is it?
It happens. Bangkok is flat and some areas have poor drainage. A heavy 1-hour downpour can fill low-lying underpasses and side streets (sois) within minutes, then drain within an hour or two after the rain stops.
Main roads like Sukhumvit and Silom mostly drain well. Side streets vary a lot depending on the soi’s drainage infrastructure. Areas like Ladprao, Bang Na, and parts of Nonthaburi have historically had worse flooding. If you are renting, ask about the soi’s flood history before signing.
Flooding in Bangkok is almost never dangerous. It is an inconvenience that will ruin your shoes.
How rainy season affects getting around
Grab surges. The moment rain starts, every driver in the city is suddenly in demand. Expect fares to jump 2 to 3 times the base rate. This is consistent and unavoidable. Budget for it or time your trips around the rain.
Motorbike taxis disappear. The orange-vest guys who zip you down the soi stop working in heavy rain. If you rely on them for the last few hundred meters to your building, you will be walking that stretch.
BTS and MRT are unaffected. The sky train and subway are completely weather-independent. If you live near a station, rainy season is entirely manageable. If you are far from one, getting around gets expensive fast.
Traffic gets significantly worse. Driving times can double during heavy rain. Factor in extra time for anything that matters.
Food delivery slows down. Grab Food, Foodpanda, and Line Man delivery times stretch during rain. What normally takes 20 minutes can take 45 to 60. The platforms still work, just slower.
The upside: Bangkok is cheaper and less crowded
Rainy season is low season for tourists. Hotels drop their rates. Serviced apartments have more availability and are more willing to negotiate. Popular restaurants and weekend markets are noticeably easier to navigate.
For remote workers, rainy season is an underrated time to be in Bangkok. Costs are lower, you are mostly inside during work hours anyway, and the city is less chaotic than peak season.
What to pack and keep in your bag
A compact umbrella. Always in your bag. The 100 to 200 baht plastic ones sold on every street corner work fine and you will not feel bad losing one.
Waterproof sandals or flip-flops. Your feet will get wet regardless. Waterproof sandals dry in minutes. Closed-toe shoes take hours.
A waterproof sleeve or pouch for your laptop. Regular backpacks soak through in a Bangkok downpour. A lightweight dry bag insert protects your electronics.
A packable rain jacket. More useful than an umbrella on a motorbike or in an open tuk-tuk.
Should rainy season put you off moving to Bangkok?
No. It is an inconvenience, not a dealbreaker. The city does not shut down. Coworking spaces, malls, restaurants, and gyms all operate normally. Bangkok is one of the most indoor-friendly cities on earth, which makes the rain season easy to work around.
Resources
- Open-Meteo — free historical and forecast weather data, no API key required
- Thai Meteorological Department — official Bangkok weather forecasts and seasonal outlooks
- Windy — real-time wind and rain tracking, useful for watching incoming storm systems