Climate & Environment

Why Nepal’s monsoon is turning more erratic, and what the climate science says

A warmer sky holds more water, and Nepal's rains now arrive in shorter, fiercer bursts — driving worse landslides and floods.

By Laxman Rawal · Aug 27, 2026

Ask anyone who has lived through a Nepali summer and they will tell you the monsoon no longer behaves the way it used to. The rains still come — broadly June to September — but they increasingly arrive in shorter, harder bursts: a month's water in a single…

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The physics: a fuller sponge in the sky

The engine behind heavier rain is old, settled science. Warm air holds more moisture than cold air — the Clausius—Clapeyron relationship — and the working rule is about 7% more water vapour for every degree Celsius of warming. A sky carrying more water has…

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What the studies find for Nepal

That distinction matters for Nepal. Studies of the South Asian monsoon find the mean circulation is in some respects weakening as the Indian Ocean warms — overall monsoon rainfall has drifted downward over central India — even as the violent, concentrated…

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What that does on the ground

Rain that falls fast, onto steep, deforested and already-saturated slopes, does not soak in — it runs off, and it can take the hillside with it. Nepal's monsoon now routinely kills people and severs highways: each summer brings landslides burying roads…

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The trend, not the forecast

No single flood proves climate change, and no dry season disproves it. What the science describes is loaded dice: a warmer atmosphere makes extreme wet events more likely and more severe, year on year, on top of whatever any given monsoon does. For Nepal —…

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