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Historic monsoon rains and flooding in Pakistan have affected more than 30 million people over the last few weeks, the country's climate change minister said, calling the situation a "climate-induced humanitarian disaster of epic proportions".

Pakistan has urged the international community to help with relief efforts as it struggles to cope with the aftermath of torrential rains that have triggered massive floods since last month, killing more than 900 people.

"33 million have been affected, in different ways; the final homeless figure is being assessed," Climate Change Minister Sherry Rehman told Reuters in a text message.

The southern province of Sindh, hardest hit in the last few days, had requested one million tents for affected people.

"Needs assessment is being done, we have to make U.N.’s international flash appeal; this is not the task of one country or one province, it is a climate-induced disaster," Rehman added.

Ahsan Iqbal, Minister for Planning and Development, said that 30 million people had been affected, a figure that would represent about 15% of the South Asian country's population.

Monsoon rains had affected some 3 million people in Pakistan of which 184,000 have been displaced to relief camps across the country, said UN agency Office for the Coordination of Humanitarian Affairs (OCHA).

Funding and reconstruction efforts will be a challenge for cash-strapped Pakistan, which is having to cut spending to ensure the International Monetary Fund approves the release of much-needed bailout money.

In the last 24 hours, 150 kilometres of roads had been damaged across the country, and over 82,000 homes have been partially or fully damaged.