September weather forecast and climate
Kathmandu, Nepal

Beautiful ancient monuments in the Durbar square in Kathmandu, Nepal
Beautiful ancient monuments in the Durbar square in Kathmandu, Nepal
The first month of the autumn, September, is still a warm month in Kathmandu, Nepal, with temperature in the range of an average low of 18.5°C (65.3°F) and an average high of 28.1°C (82.6°F).

Temperature

In Kathmandu, the average high-temperature is relatively the same as in August - a still warm 28.1°C (82.6°F). The average low-temperature, in Kathmandu, is 18.5°C (65.3°F).

Heat index

The average heat index is calculated to a hot 32.7°C (90.9°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, differences in body mass, height, and shape, wind, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Kathmandu, the average relative humidity in September is 82%.

Rainfall

In Kathmandu, during 15 rainfall days, 199.8mm (7.87") of precipitation is typically accumulated. In Kathmandu, Nepal, during the entire year, the rain falls for 110 days and collects up to 1454.9mm (57.28") of precipitation.

Daylight

In September, the average length of the day in Kathmandu is 12.3h.

Sunshine

Months with the least sunshine are July and September, with an average of 4.4h of sunshine.

UV index

In Kathmandu, the average daily maximum UV index is 11. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 11 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used.

What is the temperature in September in Kathmandu?

The average high-temperature, in September, in Kathmandu, Nepal, is 28.1°C (82.6°F), while the average low-temperature is 18.5°C (65.3°F). In September, the average heat index (a.k.a. 'feels like', 'real feel'), that represents influence of the relative humidity to air temperaure, is evaluated at 32.7°C (90.9°F).

What is the average humidity in September in Kathmandu?

In September, the average relative humidity in Kathmandu, Nepal, is 82%.

How many days does it rain in September in Kathmandu?

In September, in Kathmandu, Nepal, the rain falls for 15 days. Throughout September, 199.8mm (7.87") of precipitation is accumulated.

How many hours of daylight does Kathmandu have in September?

In Kathmandu, Nepal, the average length of the day in September is 12.3h.

What is the month with the least sunshine in Kathmandu?

July and September, with an average of 4.4h of sunshine, are months with the least sunshine in Kathmandu, Nepal.

How many hours of sunshine does Kathmandu have in September?

The average sunshine in September in Kathmandu is 4.4h.

How high is the UV index in September in Kathmandu?

In September, the average daily maximum UV index in Kathmandu is 11. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV rays.
Average temperature in September - Kathmandu, Nepal
  • Average high temperature in September: 28.1°C

The warmest month (with the highest average high temperature) is June (29.1°C).
The month with the lowest average high temperature is January (19.1°C).

  • Average low temperature in September: 18.5°C

The month with the highest average low temperature is July (20.2°C).
The coldest month (with the lowest average low temperature) is January (2.4°C).

Average humidity in September - Kathmandu, Nepal
  • Average humidity in September: 82%

The month with the highest relative humidity is November (85%).
The month with the lowest relative humidity is April (53%).

Average rainfall in September - Kathmandu, Nepal
  • Average rainfall in September: 199.8mm

The wettest month (with the highest rainfall) is July (363.4mm).
The driest month (with the least rainfall) is November (8.3mm).

Average rainfall days in September - Kathmandu, Nepal
  • Average rainfall days in September: 15 days

The month with the highest number of rainy days is July (23 days).
Months with the least rainy days are November and December (1 days).

Average daylight in September / Average sunshine in September - Kathmandu, Nepal
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.9h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 4.4h

The month with the most sunshine is February (Average sunshine: 9.1h).
Months with the least sunshine are July and September (Average sunshine: 4.4).

Average UV index in September - Kathmandu, Nepal
  • Average UV index in September: 11

Months with the highest UV index are April, May, June, July and August (UV index 12).
Months with the lowest UV index are January and December (UV index 5).