This month is very similar to April.
However May is considered even hotter as, during this period, even the night time temperatures stay quite high.
The average day time temperatures are around 30°C (86°F) whereas during the night the average minimum temperatures drop to around 20°C (68°F).
There are also chances of rain during this month, however the real downpours of the rainy season do not begin until the end of June.
There are a lot of things to do and experience in Kathmandu during this month.
You can expect to have sunlight for 8 to 9 hours a day throughout this month.
May has a bit better visibility compared to its preceding months, making it a better time of year to explore the area's scenery and natural beauty.
It is also a good time to go for hiking trips due to the good weather.