Temperatures are expected to be up to two degrees Celsius hotter than average across the region, with forecasts for above-average rains, according to a monsoon outlook released by Kathmandu-based International Centre for Integrated Mountain Development (ICIMOD) on Wednesday.
"Rising temperatures and more extreme rain raise the risk of water-induced disasters such as floods, landslides, and debris flows, and have longer-term impacts on glaciers, snow reserves, and permafrost," Arun Bhakta Shrestha, a senior adviser at ICIMOD, said in a statement.
The summer monsoon, which brings South Asia 70-80 percent of its annual rainfall, is vital for agriculture and therefore for the livelihoods of millions of farmers and for food security in a region that is home to around two billion people.
However, it also brings destruction through landslides and floods every year. Melting glaciers add to the volume of water, while unregulated construction in flood-prone areas exacerbates the damage.
"What we have seen over the years are also cascading disasters where, for example, heavy rainfall can lead to landslides, and landslides can actually block rivers. We need to be aware about such possibilities," Saswata Sanyal, manager of ICIMOD's Disaster Risk Reduction work, told AFP.
Last year's monsoon season brought devastating landslides and floods across South Asia and killed hundreds of people, including more than 300 in Nepal.
This year, Nepal has set up a monsoon response command post, led by its National Disaster Risk Reduction and Management Authority.
"We are coordinating to stay prepared and to share data and alerts up to the local level for early response. Our security forces are on standby for rescue efforts," said agency spokesman Ram Bahadur KC.
Weather-related disasters are common during the monsoon season from June to September but experts say climate change, coupled with urbanisation, is increasing their frequency and severity.
The UN's World Meteorological Organization said last year that increasingly intense floods and droughts are a "distress signal" of what is to come as climate change makes the planet's water cycle ever more unpredictable.
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