Monday, September 30, 2013

September weather trend in Kathmandu in recent years

September is the month of transition from the wet monsoon to dry autumn. Kathmandu starts to feel morning and evening chill towards the end of this month, whereas the daytime temperature still hovers around 30°Celsius.

In terms of temperature, this year, the month remained about in average. The average maximum temperature of the month was about a degree higher than past 30 years average, however, it was in par with the average maximum temperature for the month in last 6 years. This month's average maximum temperature stayed at 29.3°C, whereas the 30 years average for the month is 28°C

September 14th was the hottest day this month which recorded 31.5°C. Sept 8th, 2012 was the hottest September day in recent years with the maximum temperature of 32.3°C. Whereas September 16th this year was the coldest day in the month of September in recent years with mercury dipping down to 15.5°. Sept 26, 2011 was coolest September day in recent years, with the mercury staying within 18.3°C.

The average monthly rainfall in Kathmandu in September is 199.8mm. The maximum 24 hours rainfall recorded in the month was 134.7mm in Sept 13, 2012. This month the total rainfall was 218.1mm, that was just about the monthly average. 2012 September was the wettest September in recent year, in which the total precipitation amounted to 476.1mm. As of the end of September, Kathmandu received total of 1,841mm of rain, which is already about 368mm more than the average annual rainfall, with this it is the already the second wettest year after 2002 in Kathmandu in past 35 year.

Below comparison of September 2013 weather trend to past six years trend.

Daily averages

Daily Max

Daily Min

Averages and extremes

Number of warm and cold days

data: Meteorological Forecasting Division, Department of Hydrology and Meteorology, World Meteorological Organization,

Monthly weather trends in recent years for other months:

Kathmandu Weather Outlook >> Click here

Related topics:
Weather Forecast for next 48 hours
Kathmandu Rainfall watch
Nepal Flood Watch
Cyclone watch


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