South Asian Monsoon 2025: Wetter, Hotter & More Unpredictable

South Asia is bracing for an intensified summer monsoon in 2025, with temperatures forecasted up to 2 °C above normal and above-average rainfall across India, Nepal, Tibet, and neighbouring regions. Issued by ICIMOD and backed by global models, this outlook raises concerns over extreme weather risks and long-term monsoon shifts under climate change. Nearly, 72–75% of past floods in South Asia, occurred during summer monsoon season. 

Mortality rates across South Asia 

• From June to August 2025, Pakistan faced deadly floods fueled by intense monsoon rains and accelerated glacial melt. Over 260 people lost their lives, with Punjab and Gilgit-Baltistan among the worst-affected areas. Infrastructure damage and displacement continue to rise as the monsoon persists. 

• In Himachal Pradesh (North India), heavy monsoon rains triggered 173 deaths between June and July 2025 due to cloudbursts, flash floods, and landslides. The state reported 25 cloudbursts and over 40 flood events, prompting urgent plans to implement early warning systems. 

• From May 28 to June 30, 2025  (covering the early part of the monsoon), Nepal recorded. 31 deaths and 151 injuries across 682 monsoon-related incidents (floods, landslides, lightning, windstorms). 

Key Insights:  

• +2 °C seasonal anomaly expected in the Hindu Kush Himalayan (HKH) region. 

• ️ Above-normal rainfall predicted, heightening risks of flash floods and landslides, and Glacial Lake Outburst Flood. 

• South Asia’s agriculture and water systems, supporting nearly 2 billion people, face heightened vulnerability due to increased rainfall variability. 

• Monsoon circulation is becoming weaker even though rainfall is increasing. This contradiction is caused by global warming, which increases heat and moisture in the atmosphere while reducing vertical air movement. 

• The variation within a single monsoon season, such as the switching between wet and dry periods, is still difficult to predict accurately using current climate models. 

• The El Niño–Southern Oscillation remains a major factor affecting yearly changes in monsoon rainfall. However, climate change may either strengthen or weaken its effects, leading to more unpredictable rainfall from year to year. 

• Changes in the polar regions, such as warming Arctic and Antarctic temperatures and melting sea ice, can disrupt global atmospheric circulation. These disruptions can shift the position and strength of the Pacific jet stream, which in turn can influence the behaviour and intensity of the El Niño–Southern Oscillation, making it more erratic and harder to predict. 

The 2025 monsoon underscores a broader climate reality, intensified rain, weakened wind patterns, and erratic variability. In a warming world, South Asia must prepare not just for “more rain,” but for more uncertainty. Investing in science-driven planning today could protect lives, food security, and ecosystems tomorrow. 

Read more about extreme weather here.  

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