Footage shows a flooded road following heavy rain in Bangkok, Thailand, on Wednesday evening July 20.

The tropical downpour battered the Huai Khwang district of the capital city following high temperatures earlier in the day that passed 30 degrees Celsius.

Resident Rattiyakorn Dacanay was riding a motorcycle home from work when she was stuck at a crossroads where the water was more than 30cm deep.

She said: 'All my clothes were wet from the rain.'

Thailand and other countries in Southeast Asia such as Malaysia, Indonesia, Myanmar, and the Philippines are at the start of their tropical monsoon rainy season, which lasts until late November.

Soaring temperatures reaching 35 degrees Celsius are often followed by powerful tropical storms with thunder, lightning, rain and flash floods which cause rivers to flow faster and become dangerous.

Many of the under-developed nations struggle to cope with the heavy rain due to chronic under-investment infrastructure and high levels of corruption funnelling away public funds away from projects such as roads and drainage.

Thailand was ranked 110 out of 180 on Transparency International's 2021 Corruption Perception Index. Denmark, Finland and New Zealand were ranked joint first place while South Sudan was bottom.