Kathmandu weather by month
Kathmandu runs from about 10°C in January to 24°C in July, with July the wettest month at 804 mm.
warmest month
July
24°C
coolest month
January
10°C
wettest month
July
804 mm
worst air month
January
75 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 10°C | 5 mm | 298 h | 75 |
| February | 12°C | 4 mm | 288 h | 67 |
| March | 16°C | 44 mm | 311 h | 60 |
| April | 22°C | 1 mm | 354 h | 36 |
| May | 22°C | 112 mm | 345 h | 37 |
| June | 23°C | 302 mm | 335 h | 40 |
| July | 24°C | 804 mm | 250 h | 29 |
| August | 23°C | 624 mm | 282 h | 24 |
| September | 22°C | 546 mm | 254 h | 25 |
| October | 19°C | 57 mm | 305 h | 29 |
| November | 16°C | 18 mm | 290 h | 43 |
| December | 12°C | 6 mm | 292 h | 63 |
About 3,604 hours of sun a year. Roughly 145 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.