Nepal is reeling from its worst flooding in decades after ferocious monsoon rains swelled rivers and inundated entire neighbourhoods in the capital Kathmandu, killing at least 236 people.

Deadly floods and landslides are common across South Asia during the monsoon season from June to September, but experts say climate change is making them worse.

The Kathmandu valley recorded 240 millimetres (9.4 inches) of rain in the 24 hours to Saturday morning, the country's weather bureau told the Kathmandu Post newspaper.