Nepal Trekking in Monsoon Season: What You Really Need to Know

Nepal's monsoon season (June to September) is when most trekkers stay home — and that is exactly why some of us love it. The trails are empty, the tea houses are cheap, the valleys are impossibly green, and the waterfalls are at full force. But monsoon trekking in Nepal has real challenges: leeches, landslides, clouded mountain views and washed-out trails. Here is the honest guide to trekking Nepal in monsoon — when to go, where to go, and what to expect.

When Is Monsoon in Nepal?

The Nepal monsoon typically runs from mid-June to mid-September, with peak rainfall in July and August. The monsoon arrives first in the east (around June 10) and moves west, reaching the Annapurna region by June 20 and the far west (Dolpo) by early July. The monsoon retreats in reverse, with the west clearing first (early September) and the east clearing last (late September).

Rainfall varies dramatically by region. The Annapurna and Everest regions receive 2,500–3,500 mm of rain during monsoon. The Dharan and Pokhara climate data shows just how much rain this is — about 80% of Nepal's annual rainfall comes in these 4 months. By contrast, Upper Mustang and Upper Dolpo receive almost no rain because they sit in the rain shadow of the Himalayas.

Where Can You Trek in Monsoon?

Rain Shadow Treks (Best for Monsoon)

The best monsoon treks are in the Himalayan rain shadow — regions that the monsoon clouds cannot reach because they are blocked by higher mountains:

• Upper Mustang — the best monsoon trek in Nepal. Rain shadow, dry, beautiful. See our Upper Mustang guide.
• Upper Dolpo — also in the rain shadow, but expensive and remote.
• Annapurna Circuit upper section (Manang side) — the pass itself (Thorong La) is often closed in monsoon, but the Manang side is relatively dry.
• Jomsom Muktinath trek — the Kali Gandaki valley sits in partial rain shadow.
• Nar Phu Valley — see our Nar Phu guide.

Treks That Are Possible But Challenging in Monsoon

• Everest Base Camp — Lukla flights are frequently delayed or cancelled by cloud cover. The trail is wet and leech-ridden below Namche. Mountain views are usually clouded out by 10 am.
• Annapurna Circuit — Thorong La is often closed due to snow. Lower sections are wet and leech-infested.
• Langtang Valley — wet, leechy, but the upper valley can clear in the afternoon.
• Helambu — same as Langtang. Lower sections are miserable; upper sections can be ok.

Treks to Avoid in Monsoon

• Poon Hill — low altitude, heavy rain, leeches, no mountain views. Skip it.
• Annapurna Base Camp — the trail is a river of mud in monsoon. Skip it.
• Mardi Himal — same problem. Skip it.
• Kanchenjunga — heavy rain, landslides, leeches, no mountain views. Skip it.
• Makalu Base Camp — the lower trail (Num to Tashigaon) is a notorious leech highway. Skip it.

What to Expect on a Monsoon Trek

Weather Patterns

Monsoon trekking in Nepal has a predictable daily pattern:

• Mornings (5 am – 10 am) — usually clear. Best time for hiking and mountain views.
• Late mornings (10 am – 1 pm) — cloud builds up. Mountain views disappear.
• Afternoons (1 pm – 6 pm) — heavy rain, thunder, lightning. You will usually be in a tea house by this point.
• Nights — rain continues, sometimes heavy. Tea house roofs are tin — it is loud.

If you are an early starter, you can get 4–5 hours of clear hiking in the morning before the rain starts. This is the key to enjoying monsoon trekking.

Leeches — The Unpleasant Reality

Leeches are the most complained-about feature of monsoon trekking in Nepal. They are not dangerous (they do not transmit disease), but they are unpleasant. Leeches are found on the lower trails (below 2,500 m) from June to September.

• Prevention: Wear long trousers tucked into socks, use DEET-based insect repellent on shoes and ankles, treat boots and trousers with permethrin.
• Removal: Do not pull a leech off — its mouth parts can stay in your skin and cause infection. Apply salt, vinegar or a lit cigarette to make it release. The wound will bleed freely for an hour (leeches inject an anticoagulant) — this is normal.
• Leech socks: Special tight-weave socks that leeches cannot penetrate. Available in Kathmandu trekking shops for $5–$10. Highly recommended.

Landslides — The Real Danger

Landslides are the most dangerous aspect of monsoon trekking. Heavy rain saturates the soil on steep slopes, causing them to give way. Landslides are most common on the lower Annapurna and Langtang trails (below 2,500 m), and on the road approaches to trailheads.

What to Pack for Monsoon Trekking

• High-quality rain jacket — Gore-Tex or equivalent. Not a cheap poncho.
• Rain trousers — same quality as the jacket.
• Backpack rain cover — and a dry bag inside your pack for extra protection.
• Dry bags — for sleeping bag, electronics, clothes. Multiple small ones are better than one big one.
• Leech socks — buy in Kathmandu.
• Gaiters — keep mud and leeches out of your boots.
• Quick-dry clothing — cotton takes days to dry in monsoon humidity.
• Trekking umbrella — useful for rain and intense sun. Get one with a curved handle.
• Plastic bags — for wet clothes, used toilet paper, and protecting electronics.
• Waterproof phone case — monsoon humidity will kill a phone.

Pros of Monsoon Trekking

• No crowds — tea houses are half-empty, trails are quiet, no queues at viewpoints.
• Cheaper prices — tea houses and agencies offer off-season discounts of 20–40%.
• Lush greenery — the hills are at their most beautiful, with wildflowers, waterfalls and full rivers.
• Local life — you see Nepal villages at their most 'lived-in', with farming, festivals and daily life in full swing.
• Wildlife — birds and butterflies are at peak activity in monsoon.
• Rhododendrons — late monsoon (August–September) sees second rhododendron blooms at higher elevations.

Cons of Monsoon Trekking

• No mountain views — clouds usually obscure the peaks by 10 am. You might get 4–5 days of clear views on a 14-day trek.
• Leeches — see above. Unpleasant but manageable.
• Landslide risk — see above. Real danger on some trails.
• Lukla flight delays — if you are trekking in the Everest region, expect multi-day delays due to cloud cover at Lukla.
• Trail closures — Thorong La, Larkya La and other high passes are often closed by snow even in monsoon.
• Wet gear — nothing dries in monsoon. Your clothes will be damp for 14 days.
• Mud — the lower trails become rivers of slippery mud. Bring trekking poles.

Best Monsoon Trek Itinerary: Upper Mustang

If I had to pick one Nepal trek for monsoon, it would be Upper Mustang. The region sits in the rain shadow of the Annapurna and Dhaulagiri massifs, receiving less than 200 mm of rain per year. The landscape is a high-altitude desert of red rock canyons, ancient walled villages and Tibetan Buddhist culture — completely different from the rest of Nepal. The trail is dry, the skies are clear, and the tea houses are nearly empty. See our Upper Mustang cost and permit guide for the full itinerary.

Monsoon trekking in Nepal is not for everyone. But for the right trekker — one who values empty trails over clear skies, who can handle leeches and rain, and who is willing to go to the rain shadow regions — it can be one of the most rewarding Nepal trekking experiences you will ever have. For the full month-by-month guide to Nepal trekking seasons, see our best time to visit Nepal guide.