Kathmandu records about 1500mm of rain across roughly 105 wet days a year, which is a 29% chance on an average day. July is the wettest month at 380mm (25% of the annual total) and December the driest at 4mm. Local rain type: monsoon. Kathmandu's monsoon (June-September) makes trekking extremely difficult. Clear mountain views are best in October-November and March-April.
Chance of rain on an average day: 29%
Rainfall climatology for Kathmandu. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1500mm |
| Rain days per year | 105 |
| Odds on an average day | 29% |
| Wettest month | July — 380mm over 28 days |
| Driest month | December — 4mm over 1 days |
| Rain type | monsoon |
| Best dry window | October and November offer the clearest skies and best Himalayan views. |
| Worst rain window | July and August bring the heaviest monsoon rain — landslides can close mountain roads. |
July delivers 9400% more rain than December (380mm vs 4mm). That gap is the difference between planning around showers and ignoring them.
25% of the year's rain falls in July alone, so Kathmandu has a genuine wet season rather than evenly spread showers.
Kathmandu rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 28 days in July against 1 in December — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 15mm | 1 | 3% | 19°C |
| February | 21mm | 2 | 7% | 19°C |
| March | 30mm | 2 | 7% | 21°C |
| April | 53mm | 4 | 13% | 23°C |
| May | 120mm | 9 | 30% | 26°C |
| June | 260mm | 19 | 63% | 28°C |
| July | 380mm | 28 | 93% | 30°C |
| August | 310mm | 22 | 73% | 30°C |
| September | 198mm | 14 | 47% | 28°C |
| October | 48mm | 3 | 10% | 26°C |
| November | 8mm | 1 | 3% | 23°C |
| December | 4mm | 1 | 3% | 21°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Kathmandu we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Kathmandu records rain on roughly 105 days a year — about a 29% chance on any given day — totalling around 1500mm.
July, with about 380mm over 28 rain days. That is 25% of the entire year's rainfall in a single month.
December is the driest month at 4mm across roughly 1 days. October and November offer the clearest skies and best Himalayan views.
Kathmandu's monsoon (June-September) makes trekking extremely difficult. Clear mountain views are best in October-November and March-April.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.