When does Nepal’s monsoon actually end in 2026, and why the official date keeps slipping

The monsoon will not end in Nepal on 30 September, whatever the calendar says. The Department of Hydrology and Meteorology puts the normal withdrawal at 2 October, and the monsoon has missed that date in every one of the last four years — withdrawing on 16 October, 15 October, 12 October and 10 October. If you are booking an autumn trek, the honest planning date for clear skies is the second week of October, not the first.

When will the monsoon end in Nepal in 2026?

DHM has not announced a 2026 withdrawal date yet, and it will not until the retreat is actually underway — the announcement usually lands within a few days of the event. On the last four years’ record, expect it to leave eastern Nepal somewhere between 8 and 16 October.

That date is the last exit, not the first. The monsoon retreats west to east, so the far west clears first, the Annapurna side a few days later and the Everest side last. In 2025, DHM reported the rains gone from Sudurpaschim, Karnali, western Lumbini and parts of Gandaki on 6 October — four days before they left the east on 10 October. If your trek starts from Pokhara, you are usually a few days ahead of the table below; from Lukla, you are on it.

Two things are worth reading off that table. The monsoon has run late four years in a row, so treating 30 September as the finish line is how people end up walking the first week of October in cloud. But the lateness is also shrinking — 14 days, then 13, then 10, then 8 — so the gap is narrowing rather than widening. And 2026 started late (19 June against a 13 June normal), which historically does not push withdrawal later; onset and withdrawal are only loosely related.

For the record, DHM’s extremes since 1968 are an earliest withdrawal of 2 September 1995 and a latest of 19 October 2013. The normal season runs 112 days; 2025 ran 135, the longest DHM has recorded, taking the record from 2022’s 134. So a first-week-of-October trek is not doomed — it is a coin toss, and the second week is not.

If you are planning a Nepal trip around the rains, timing is everything — and 2026 is an unusual year. The monsoon reshapes where and when you can trek, but it never shuts the country down. Here are the real 2026 dates from Nepal’s weather office, what they mean on the trail, and the regions that stay dry and walkable straight through summer.

What the 2026 monsoon is actually doing

Monsoon winds from the Bay of Bengal reached eastern Nepal on 19 June 2026 — roughly a week later than the long-term average onset of 13 June — according to the Department of Hydrology and Meteorology (DHM). Forecasters expect a weaker-than-normal season: southern Karnali, much of Lumbini, eastern Madhesh and southern Koshi each carry a 55–65% probability of below-average rainfall, alongside above-normal temperatures.

One caveat worth its own headline: a drier total does not mean a safer monsoon. The pattern this year — long dry spells broken by short, violent downpours — is exactly what triggers flash floods and landslides, as we explain in our 2026 monsoon risk briefing.

What it means for trekking

Monsoon rain mostly falls in the afternoons and evenings. Expect lush green hills, leeches in the forest below ~2,500 m, cloud that hides the high peaks, and landslide-prone roads. The classic trails — Everest, Annapurna, Langtang — are best avoided at the height of it (July–August). But here is the point most people miss: a big slice of Nepal sits in the rain shadow north of the main Himalaya and stays dry and trekkable all summer.

The late-September trade-off

Late September is the window people argue about most, so here it is straight. For it: the country is at its greenest, the rivers are full, the air is washed clean and the teahouses are quiet. Against it: the monsoon has not finished, so afternoon rain is still likely, the forested lower sections keep their leeches until the ground dries, and mountain views are hit-or-miss until the cloud lifts for good. If you are flexible and carry a proper rain shell, it is a lovely, uncrowded time to walk. If you have flown a long way for one clear morning at a viewpoint, wait for mid-October. And if late September is the only time you have, the rain-shadow treks are already dry.

How roads and flights recover as the rain stops

Roads and flights come back on the same curve as the sky, a week or two behind it. Through the monsoon the mountain highways take a beating: slips close sections, and trailhead roads such as the ones to Machha Khola or Syabrubesi can wash out. This year the worst of it hit the country’s main tourist road — the Prithvi Highway at Krishnabhir, closed for 18 days until 17 September. As the rain stops, crews clear the slips, surfaces dry and firm up, and journeys that were a lottery in July become dependable by mid-October.

Mountain flights follow the weather too. Low cloud grounds the small planes into Lukla and Jomsom for hours or whole mornings in the wet months; once autumn settles, the flying windows open and delays shrink. Note one thing that does not improve with the weather: in peak autumn, Lukla flights are routed through Manthali (Ramechhap) to ease congestion in Kathmandu, which adds a four-to-five-hour drive — see our report on Lukla flights via Ramechhap.

Where you can still trek in the monsoon

Behind the wall of Dhaulagiri and the Annapurnas, the trans-Himalayan valleys get only a fraction of the rain that soaks the southern hills. That is why Upper Mustang, Dolpo, Jomsom–Muktinath and Nar Phu stay open and rewarding through the summer, with desert colour, clear skies and Tibetan-Buddhist culture instead of mud. For the full list and route notes, see our monsoon rain-shadow guide and current monsoon road conditions.

Bottom line for 2026: the monsoon came late and was forecast to run dry, and it still produced the worst flood of the year in late August. For the classic trails, plan your clear-sky days from the second week of October; if you are already here or cannot wait, trek the rain shadow.

More on timing: is September too early to trek Nepal? · the best two weeks to trek this autumn · best time to trek, month by month.

Sources: Department of Hydrology and Meteorology (DHM), monsoon onset and withdrawal dates and State of the Nepal Climate 2025; The Himalayan Times, DHM withdrawal bulletin, 6 October 2025; The Kathmandu Post; myRepublica. Updated 18 September 2026.

Cover photo: NASA via Wikimedia Commons (Public domain). Airstrip photo: aaerux studio via Pexels (Pexels licence).