Kathmandu weather in September
September in Kathmandu: hot, soaked, with very humid — a fair time to visit.
#10 of 12 months in Kathmandu · #548 of 604 destinations to visit in September · comfort 55/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Kathmandu climate normals — September
| Daytime high | 25°C / 77°F | 🥵 hot |
|---|---|---|
| Nighttime low | 20°C / 68°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 424 mm / 16.7 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 89% | 💦 very humid |
| Dew point | 20°C / 68°F | |
| Sunshine | 7.1 h/day | |
| Daylight | 12.3 h | |
| Wind | 6 km/h / 3 mph | |
| Air quality (US AQI) | 63 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Kathmandu in September — FAQ
- Is September a good time to visit Kathmandu?
- September in Kathmandu: hot, soaked, with very humid — a fair time to visit. It ranks #10 of 12 months for Kathmandu on SeasonMap's comfort score (55/100).
- What is the weather like in Kathmandu in September?
- In September, Kathmandu averages a daily high of 25.2°C and a low of 19.8°C, with about 424.4 mm of rain over roughly 29.4 rainy days.
- What is the air quality in Kathmandu in September?
- Kathmandu has a mean US Air Quality Index of about 63 in September.