WEATHER · CLIMATE NORMALS · 1991–2020
Kathmandu Climate — Averages by Month
What the weather in Kathmandu, NPaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 9.3 °C · coldest | 49.3 mm |
| February | 11.8 °C | 55.2 mm |
| March | 15.5 °C | 58.1 mm |
| April | 18.8 °C | 83.0 mm |
| May | 20.4 °C | 205.8 mm |
| June | 21.9 °C | 474.0 mm |
| July | 22.0 °C · warmest | 782.4 mm · wettest |
| August | 22.0 °C | 643.4 mm |
| September | 21.1 °C | 339.7 mm |
| October | 18.2 °C | 95.0 mm |
| November | 14.2 °C | 29.9 mm |
| December | 10.8 °C | 26.0 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Kathmandu — centred at 27.75°N, 85.25°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.