This is the heroic moment a brave volunteer risked his life to save a villager clinging to a tree while trapped in raging monsoon floods in Thailand.

The rescuer, wearing an orange life vest and holding onto a lifeline, made his way across the fast-flowing chest-deep muddy deluge to save the elderly woman who was stranded on her tricycle in Rayong province on September 7.

Upon reaching the lady, he removed his life vest and made her wear it, opting to use a life preserver he had brought along instead. The pair were pulled back to safety by the rescue team standing by.

Onlooker Prapad Somsakul said: 'The woman was driving along a flooded road when the torrent suddenly swept her away. I'm glad she's safe now.'

Thailand and other countries in Southeast Asia, such as Malaysia, Indonesia and the Philippines, are in the middle of their tropical monsoon rainy season, which lasts from May or June until 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.

This year, meteorologists have blamed climate change for the sustained heavy rain, which has been hitting the Thai capital and provinces around the country causing severe floods for several weeks.

Warnings of strong wind and storms were also issued for regions across the northeast, east, and south. Thailand's Center for Climate Change and Disaster claimed the coming months could see heavier, longer rainfalls, due to 'climate change'.

Local media reported that the country has this year seen 'an unusually sustained and persistent rainy season'.