The highest day temperature in September 2026 was 81°F. The lowest night temperature was 62°F. The average values for day and night temperatures during September were 75.4°F и 66.3°F respectivly.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Kathmandu is 13.3 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 2.8 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Kathmandu in September is 6.2 hours.