Usually the weather in Kathmandu for the month of May is 20 with the high being 29 and typical average low being around 15 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 20 |
| High Temperature | 29 |
| Low Temperature | 15 |
| Sunshine Per Day | 9 |
Useful Links: Kathmandu Weather: Average Weather & Yearly Climate