Langtang Valley Trek Weather by Month

This guide breaks down exactly what to expect, month by month and altitude by altitude, using our own operational temperature data from running this route every season.

If you're trying to decide when to book, our Best Time for Langtang Valley Trek guide turns this same data into a real recommendation. This article is the reference underneath it — the numbers, not the advice. It supports our Langtang Valley Trek page.

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Climate Overview

These are typical ranges, not guarantees — mountain weather varies year to year, and any single day can fall outside these bands. Treat this table as a planning baseline, and confirm closer to your travel date if precision matters for your packing decisions. 

Month-by-Month Detail

January

The coldest month on the route. Kyanjin Gompa nights regularly fall to -18°C to -22°C, and daytime temperatures at altitude stay below freezing more often than not. Lower down, Syabrubesi and the forest sections between Lama Hotel and Langtang Village stay comfortable by day (2–10°C) even as the upper valley locks into deep winter. Rainfall is minimal — this is a dry-cold month, not a wet one. Skies are frequently clear, since winter's cold, dense air holds less moisture and produces fewer clouds than the shoulder seasons. Snow cover is established above Langtang Village and can be substantial near Kyanjin Ri and Tserko Ri.

February

Still genuinely cold, but the coldest extremes of January begin easing, particularly in the second half of the month. Kyanjin Gompa nights run -15°C to -20°C. Daytime temperatures at altitude start climbing above freezing more consistently by late February. Rainfall remains low. This is the month we'd point to if you want a winter-adjacent experience without January's full intensity — teahouses that closed for deep winter often begin reopening toward the end of the month.

March

The transition into spring. Lower trail daytime temperatures reach 8–15°C, genuinely comfortable walking weather, while Kyanjin Gompa still holds real winter character at night (-10°C to -15°C). Rainfall picks up slightly from winter's low baseline but remains modest. Snow can still linger at higher elevations, particularly in the first half of the month — a late-season snowfall near Tserko Ri isn't unusual even as the lower valley warms. 

April

One of the two strongest weather months of the year. Lower trail daytime temperatures climb to a genuinely warm 15–23°C, and Kyanjin Gompa becomes noticeably milder both day (5–12°C) and night (-5°C to -10°C) compared to March. Rainfall increases moderately — afternoon showers become more common, though they rarely disrupt a full trekking day. This is rhododendron season in the forest sections, and visibility is generally strong through most of the month.

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May

Warm and building toward the pre-monsoon transition. Lower trail temperatures reach their yearly peak (17–24°C), and even Kyanjin Gompa holds comparatively mild daytime conditions (7–13°C). Rainfall rises further through the month, particularly in the second half, as pre-monsoon weather patterns establish. Humidity increases accordingly. Early May tracks closer to April's stable pattern; late May starts to resemble the wetter conditions ahead.

June

The monsoon begins in earnest, usually within the first two weeks. Temperatures stay warm across the route (18–24°C lower trail, 9–14°C Kyanjin Gompa by day), but rainfall rises sharply, and cloud cover becomes the dominant daily pattern rather than the exception. Afternoon downpours are common; mornings sometimes offer a clearer window before cloud builds. 

July

The wettest month of the year on this route. Rainfall is heavy and frequent, often daily, with sustained cloud cover limiting mountain visibility for much of each day. Temperatures remain warm throughout the route. Humidity is at its yearly peak. This is also when the lower forest sections see the most leech activity, a direct consequence of the sustained moisture.

August

Similarly wet to July, with rainfall beginning to show early signs of easing toward the very end of the month. Temperatures hold steady in the same warm range as June and July. Cloud cover remains the default condition for most of each day, though brief clearer windows do occur. 

September

The genuine transition month, and the one most worth understanding in two halves rather than as a single block. The first two weeks typically still carry real monsoon-pattern rainfall and afternoon cloud. From roughly mid-month, conditions improve steadily — rainfall drops, visibility strengthens, and daytime temperatures settle into a comfortable 15–22°C at lower elevations. Kyanjin Gompa cools accordingly (5–11°C by day), with nights dropping to -3°C to -8°C.

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October

The driest, clearest, and most stable month of the year on this route. Rainfall drops to a low baseline, and cloud cover is markedly reduced compared to every other month. Lower trail daytime temperatures settle into a comfortable 12–20°C; Kyanjin Gompa runs cooler (2–10°C by day) with nights beginning to drop meaningfully (-8°C to -13°C). This combination of low rainfall and consistently clear air is what makes October the benchmark month for mountain visibility on this route.

November

Cold but still remarkably dry and clear, particularly in the first half of the month. Rainfall reaches its lowest point of the year. Daytime temperatures cool further (10–18°C lower trail, 2–8°C Kyanjin Gompa), and nights at altitude drop into genuinely cold territory (-10°C to -16°C) by the back half of the month. Visibility remains excellent throughout — this is the month where cold, not cloud, becomes the main practical consideration.

December

Early winter, with conditions closer to November's clarity than January's deep cold, particularly in the first half of the month. Rainfall stays low. Daytime temperatures at lower elevations remain manageable (5–13°C), while Kyanjin Gompa nights push into serious cold (-14°C to -19°C) as the month progresses. Snow cover at higher elevations builds steadily through December. 

Seasonal Summary

Temperature by Altitude

The single biggest factor in how cold or warm any given day feels on this trek isn't the calendar — it's how high you are. As a rough rule, expect roughly 6–7°C of temperature drop for every 1,000 m of elevation gained, consistent with standard atmospheric lapse rates. This is why Syabrubesi (1,503 m) and Kyanjin Gompa (3,870 m) can feel like two different seasons on the same trekking day, especially outside the height of summer.

Wind chill matters as much as air temperature at the higher points on this trek, particularly on the Kyanjin Ri and Tserko Ri viewpoint hikes — an otherwise mild-sounding air temperature can feel significantly colder in exposed, windy conditions near the summits.

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Rainfall and Monsoon Patterns

Rainfall on this route follows Nepal's broader monsoon cycle closely: a dry period from roughly October through May (with a gradual, moderate increase through spring), followed by heavy, sustained rain from June through August, easing again from September.

The practical trail effect: rain hits the lower forest sections between Syabrubesi and Lama Hotel hardest, turning trail surfaces muddy and increasing leech activity in the wettest months. Higher up, precipitation increasingly falls as snow rather than rain once you're above roughly 3,000 m, particularly from November through March.

Landslide risk on the Kathmandu–Syabrubesi road rises during the heaviest monsoon rainfall (July–August specifically), an important practical consideration for trip planning independent of trail conditions themselves.

Snow and Winter Conditions

Snow becomes a genuine factor above Langtang Village from approximately November through March, with the heaviest and most consistent cover typically from December through February. Kyanjin Ri and Tserko Ri both see regular snow cover through this window, which can meaningfully increase the physical difficulty of either hike and, in heavier snow years, occasionally affects route feasibility on a given day — this is exactly the kind of call your guide makes in real time rather than something a seasonal guide can predict in advance.

Lower down, snow rarely settles below Lama Hotel even in peak winter, meaning the forest sections of the trek stay largely snow-free year-round.

What This Means for Packing

Weather this variable across a single trek means your gear list has to work across a genuine temperature swing, not just one climate. A three-layer system — moisture-wicking base, insulating mid-layer, waterproof shell — handles this far better than a single heavy jacket, regardless of which month you're trekking. Our full Langtang Valley Trek Packing List breaks this down season by season in complete detail.

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Typical Daily Weather Pattern

Beyond month-to-month averages, weather on this trek follows a fairly consistent daily rhythm worth understanding regardless of season. Mornings are typically the clearest and calmest part of the day — this is why our itinerary schedules the Kyanjin Ri and Tserko Ri viewpoint hikes to start before 7 AM, and why the Larke-style early departures common on other Himalayan routes exist for the same underlying reason here too. Cloud tends to build through the late morning and early afternoon, most noticeably in spring and monsoon, less so in autumn and winter. By late afternoon, cloud cover is often at its most extensive, before clearing again overnight as temperatures drop. Wind generally picks up through the day as well, particularly at higher elevations, making early starts doubly worthwhile — calmer conditions and clearer views together.

This daily pattern holds even within otherwise "good" months: an October morning at Kyanjin Gompa can offer a completely clear panorama that's partially obscured by early afternoon, which is exactly why we build viewpoint hikes around the morning window rather than treating any time of day as equivalent.

A Note on This Data

The figures throughout this guide represent typical ranges based on established seasonal patterns for this specific route and altitude profile, not a single authoritative measurement source or guaranteed forecast. Mountain weather in the Himalaya varies meaningfully year to year — an unusually wet October or an unusually mild January both happen, even if they're not the norm. Use this guide to understand the general pattern and plan accordingly, and check closer to your actual departure date for anything time-sensitive, particularly gear decisions for a winter or monsoon departure specifically.

Comparison With Nearby Treks

The broad seasonal pattern — wet monsoon, clear autumn, cold-dry winter, warming spring — holds consistently across Nepal's major trekking regions, since they're all governed by the same monsoon system. What differs between routes is mainly the intensity at the altitude extremes: higher treks like Everest Base Camp and Manaslu see colder nights and more sustained winter snow than Langtang's comparatively lower maximum elevation.

Frequently Asked Questions

What's the coldest month on the Langtang Valley Trek? January, with Kyanjin Gompa nights regularly reaching -18°C to -22°C.

What's the warmest month? May, with lower trail daytime temperatures reaching 17–24°C.

What's the wettest month? July, the peak of monsoon rainfall.

What's the driest month? November, followed closely by October — both see minimal rainfall.

How much colder is Kyanjin Gompa than Syabrubesi? Roughly 15–20°C colder at any given time, a direct result of the 2,367 m elevation difference between them.

Does it snow on the lower sections of the trek? Rarely — snow typically doesn't settle below Lama Hotel (2,380 m), even in peak winter.

What temperature should my sleeping bag be rated for? At least -15°C for standard autumn/spring trekking; colder-rated bags are worth considering for winter departures given Kyanjin Gompa's night temperatures.

How much does temperature drop per 1,000m of elevation gain? Roughly 6–7°C, consistent with standard atmospheric patterns.

Is there a big temperature difference between day and night? Yes, significantly, especially at higher altitude — Kyanjin Gompa can swing 15°C or more between daytime highs and overnight lows.

When does monsoon typically start? Early-to-mid June, though the exact onset varies year to year.

When does monsoon typically end? Late August into early September, with the first half of September often still carrying residual rainfall.

Is October always clear? It's the most reliably clear month of the year, though individual days can still see cloud — no month offers a complete guarantee.

How windy does it get near Kyanjin Ri and Tserko Ri? Wind is a genuine factor at these elevations year-round, and wind chill can make the effective temperature meaningfully colder than the air temperature alone suggests.

Does humidity affect the trek? Yes, particularly during monsoon and late spring, when higher humidity makes warm temperatures feel more intense and adds to overall trekking fatigue.

What's the temperature like in the forest sections between Syabrubesi and Lama Hotel? Generally mild and humid, holding warmer temperatures than the exposed upper valley throughout the year.

Are there significant temperature differences between years? Yes — these figures represent typical ranges, and any given year can run somewhat warmer, colder, wetter, or drier than the averages shown here.

Does daylight length change significantly by season? Yes — winter days are meaningfully shorter than summer ones, which affects how early you should plan to start each trekking day.

What time of year has the shortest days? December, around the winter solstice, with correspondingly earlier sunsets to plan around.

What time of year has the longest days? June, around the summer solstice, though this coincides with the least favourable weather conditions overall.

Is fog or mist common on this trek? Yes, particularly in the forest sections during monsoon and in the shoulder months, when morning mist is common before it burns off.

How reliable is mountain visibility in spring compared to autumn? Autumn is more consistently reliable; spring offers good visibility overall but with more variability, especially later in the season as humidity builds.

Does weather differ significantly between Langtang Village and Kyanjin Gompa, despite being only one day's walk apart? Yes — the 440 m elevation gain between them is enough to produce a real, noticeable temperature and conditions difference, even on the same day.

What's the best month for stargazing or clear night skies? Winter months, particularly November through February, when dry air and minimal cloud cover combine for the clearest night skies of the year.

How does weather affect the Kathmandu–Syabrubesi road journey? Heavy monsoon rain (particularly July–August) increases landslide risk along this route, a factor worth building buffer time around regardless of trail conditions further up the valley.

Is there a noticeable difference between early and late October? Not dramatically — October holds its stable, clear character fairly consistently throughout, more so than the more variable shoulder months.

Does wind chill matter more than air temperature at altitude? At the higher points on this trek, yes — factor in wind chill specifically when assessing how cold a given day at Kyanjin Ri or Tserko Ri will actually feel.

For help turning this data into an actual decision about when to book, see our Best Time for Langtang Valley Trek guide, or talk to our team about current conditions for your specific travel dates.