September weather forecast
Kathmandu, Nepal

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Beautiful ancient monuments in the Durbar square in Kathmandu, Nepal
Beautiful ancient monuments in the Durbar square in Kathmandu, Nepal

Weather in September

In September, Kathmandu witnesses a significant retreat of the monsoons, with rainfall dropping to 200mm (7.87"). The city's aesthetic transforms, presenting a greener and fresher aura, courtesy of the preceding rainfall. While the days continue to be warm, the nights start to cool off, signifying the arrival of autumn. Progressively moving from September to October, one can see a further decrease in rain and more atmospheric clarity. Consequently, this month is ideal for outdoor activities and sightseeing.

Temperature

The advent of September in Kathmandu observes an average high-temperature of a still moderately hot 28.1°C (82.6°F), nearly identical to August's 28.7°C (83.7°F). The month of September records an average low-temperature of 18.5°C (65.3°F) in Kathmandu.

Heat index

Throughout September, the heat index is estimated at a tropical 33°C (91.4°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.

Humidity

The average relative humidity in September in Kathmandu is 82%.

Rainfall

In Kathmandu, in September, during 15 rainfall days, 200mm (7.87") of precipitation is typically accumulated. In Kathmandu, during the entire year, the rain falls for 110 days and collects up to 1455mm (57.28") of precipitation.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 5:42 am and sunset at 6:24 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 5:51 pm +0545.

Sunshine

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

UV index

In September, the average daily maximum UV index in Kathmandu is 11. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 11 in September interprets into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. For those who get sunburned easily, direct sun exposure should be minimized. Always keep your skin protected with a 30 SPF sunscreen.
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Frequently asked questions

How hot does it get in Kathmandu in September?

In September, the average high-temperature and low-temperature in Kathmandu are 28.1°C (82.6°F) and 18.5°C (65.3°F) respectively. In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 33°C (91.4°F).

What is the average humidity in September in Kathmandu?

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

How many days does it rain in September in Kathmandu?

In Kathmandu, in September, it is raining for 15 days, with typically 200mm (7.87") of accumulated precipitation.

How many hours of daylight does Kathmandu have in September?

The average day length in September in Kathmandu, Nepal, is 12h and 19min.

When are sunrise and sunset in September in Kathmandu?

On the first day of September, sunrise is at 5:42 am and sunset at 6:24 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 5:51 pm +0545.

What are the months with the least sunshine in Kathmandu?

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

How many hours of sunshine does Kathmandu have in September?

The average sunshine duration in September in Kathmandu is 4.4h.

What is the UV index intensity in September in Kathmandu?

In September, the average daily maximum UV index in Kathmandu is 11. A UV Index of 11, and more, symbolizes an extreme health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Kathmandu, Nepal

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).

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Average humidity in September
Kathmandu, Nepal

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%).

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Average rainfall in September
Kathmandu, Nepal

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).

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Average rainfall days in September
Kathmandu, Nepal

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).
The months with the least rainy days are November and December (1 days).

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Average daylight in September /
Average sunshine in September
Kathmandu, Nepal

Average daylight in September / Average sunshine in September - Kathmandu, Nepal
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).

  • Average sunshine in September: 4h and 2min

The month with the most sunshine is February (Average sunshine: 9h and 6min).
The months with the least sunshine are July and September (Average sunshine: 4h and 24min).

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Average UV index in September
Kathmandu, Nepal

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

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

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Kathmandu, Nepal

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