When Does Nepal's Monsoon End? Autumn Trekking Season Opens Late September 2026

Namaste from Kathmandu. It is the last week of August as I write this, the rice paddies below the city are a hard, wet green, and the question landing in our inbox every single day is the same one: when will the monsoon actually end in 2026, and when can I trek? Here is the honest seasonal picture. The southwest monsoon over Nepal withdraws around late September into early October, and the weeks that follow — October and November — are the clearest, most stable trekking window of the entire year. If you are choosing dates right now, autumn is what you are aiming for.

When the monsoon actually ends

The monsoon is a pattern, not a switch. Sustained rain arrives in Nepal in mid-June and builds through July and August, the two wettest months. By September the system is already weakening — the rain becomes more intermittent, the gaps between downpours grow longer, and the mornings start turning clear before the afternoon cloud builds. Across the wider region the retreat is well documented: withdrawal over India typically begins in early September and finishes by around the beginning of October, and Nepal follows the same arc, with the rains generally ending by mid-October.

What I tell people is this: do not book around a single "end date." Nobody in Nepal can hand you one, and any company that promises a guaranteed dry day in late September is guessing. DHM announces the official withdrawal when the data confirms it, usually in the second half of September, and it shifts a week or two either way from year to year. For a fuller breakdown of the timing, we keep a standing explainer on when the monsoon starts and ends in Nepal that we update each season.

Month by month: August to November

Here is how the next few months tend to play out on the classic mid-altitude trails between roughly 3,500m and 5,000m — Everest, Annapurna, Langtang.

The late-September trade-off

Late September is the window trekkers argue about most, so let me be straight about it. On the plus side: the country is at its greenest, the rivers are full, the air is washed clean, the trails and teahouses are quiet, and prices have not yet hit their October peak. On the minus side: the monsoon has not fully cleared, so you can still catch rain, especially in the afternoons; the lower forested sections still have leeches until the ground dries out; and mountain views can be hit-or-miss until the cloud lifts for good. If you are flexible and don't mind carrying a good rain layer, it can be a wonderful, uncrowded time to walk. If you have travelled a long way for one guaranteed clear morning at a viewpoint, wait for October. If your only free time is right now, our rain-shadow trek guide shows where the weather already works in your favour.

How roads and flights improve

The change is not only in the sky. Through the monsoon, Nepal's mountain highways take a beating — landslides close sections, the Kathmandu–Pokhara and Prithvi corridors slow to a crawl, and the road to trailheads like Machha Khola or Syabrubesi can wash out. As the rain stops, crews clear the slips, the surfaces dry and firm up, and journeys that felt like a lottery in July become dependable again by mid-October.

Flights follow the same curve. The Lukla air-link that feeds every Everest trek is monsoon's biggest casualty — low cloud grounds planes for hours or whole mornings, and flights often shift to the Manthali (Ramechhap) staging strip in the wet months. Once autumn settles in, the flying windows open up, delays shrink, and the schedule becomes something you can actually plan around. It is exactly why October fills first.

So — when should you come?

If you want the surest bet, come in October or November, when the monsoon is gone and Nepal turns on its finest weather. If you like an empty trail and don't mind a little rain and a few leeches, late September rewards you with green hills and space to yourself. Either way, the worst of the wet is behind us within a few weeks, and the mountains are about to reappear. For a data-led look at every month, read our month-by-month best-time-to-trek breakdown.

When you are ready to put dates on the calendar, our classic autumn routes — the Everest Base Camp Trek, the Annapurna Base Camp Trek, and the shorter Ghorepani Poon Hill Trek — are all at their best from October onward. Message us and we will help you pick the window that fits your time and your fitness. See you on the trail this autumn.

Cover photo: Moin Uddin via Pexels (Pexels License).