Bangkok has always known how to live with rain. Every monsoon season, its streets briefly become rivers, storm drains overflow and the city’s hidden inhabitants—rats, cockroaches and other creatures of the underground—scramble for higher ground.

But this time, the water did not simply pass through.

It stayed.

In parts of Bangkok, around 300mm of rain fell in roughly two days, overwhelming drainage systems and turning entire neighbourhoods into vast, stagnant lakes. The government says about 40 people died in flood-related incidents, including drownings and accidental electrocutions, while thousands sought refuge in more than 230 shelters.

For 73-year-old Suleemas Kurangkul, the disaster arrived without the familiar rhythm of an afternoon storm.

“It was like all day, all night,” she recalled.

By the time the warning reached her phone, water had already risen to waist height around her home. Her apartment was safe on the second floor, but the world outside had disappeared beneath brown floodwater.

Her 1970s housing complex in Khlong Chan became one of the defining images of Bangkok’s flooding: apartment blocks surrounded by murky water, with only the roofs of submerged cars visible.

When the rain finally paused, the residents celebrated the sight of sunlight. But the retreating water left another problem behind—floating rubbish, debris and a growing stench.

Bangkok’s geography has always made it vulnerable. Built across the floodplain of the Chao Phraya River, the sprawling metropolis depends on canals, pumps and flood barriers to move water away. Yet decades of concrete development have reduced parts of the canal network, leaving the modern city increasingly dependent on infrastructure that can be overwhelmed when nature exceeds its limits.

This time, the limits were breached across all 50 districts.

The scenes were surreal. Residents used inflatable pools to navigate flooded streets. One person reportedly turned a refrigerator into a makeshift boat. Another was arrested after riding a jet ski along a main road.

But the flooding was far more than an extraordinary spectacle.

At Suvarnabhumi airport, disruption spread through the aviation system. A large portion of Thai Airways’ workforce struggled to reach work, luggage piled up and flights were cancelled. Schools closed. Traffic ground to a standstill, trapping even residents far from the worst-hit neighbourhoods.

Authorities established a war room as officials warned that additional water flowing south from northern Thailand could worsen conditions. More heavy rain was also forecast.

And beneath the immediate crisis lies a much larger question: How much water can a modern city absorb when extreme rainfall becomes increasingly common?

Scientists caution that it is too early to directly attribute this particular event to climate change. The immediate cause was a low-pressure system that travelled from an unusually warm South China Sea region and became trapped over Bangkok.

Yet the wider trend is harder to ignore.

Warmer seas can increase evaporation, while warmer air can carry more moisture. When that moisture is released, rainfall can arrive with extraordinary intensity. Research has already identified a trend towards more extreme rainfall in parts of Southeast Asia.

Bangkok’s drainage system illustrates the problem perfectly. Its canals can generally handle around 60mm of rain per hour, with upgraded sections capable of handling around 80mm. But when rainfall repeatedly exceeds those limits, the system has little opportunity to recover.

The result is not simply flooding.

It is a city temporarily losing its streets, transport, homes and routines.

Neighbouring Myanmar has also been battered by the same weather system, with flash floods, blocked roads and landslides complicating rescue operations. In one southern village, rescuers recovered bodies after a landslide killed nine people, while others remained missing.

Back in Bangkok, pumps continue working at full capacity. The water may eventually disappear, but the questions it leaves behind will remain.

For Suleemas, however, survival is less about infrastructure than solidarity.

She plans to remain with her neighbours.

“It’s hard, yes, very hard,” she said. “But together we are fighting.”

Perhaps that is the most powerful image from Bangkok’s flood—not the submerged cars, improvised boats or flooded streets, but people standing together while their city struggles to stay above water.

Because the flood may eventually drain away.