September weather forecast
New Delhi, India

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The tomb of Mughal Emperor Humayun, in New Delhi, India
The tomb of Mughal Emperor Humayun, in New Delhi, India

Weather in September

September indicates the receding of the monsoon season, as Delhi starts witnessing a decrease in the frequency of rainfall. Though the showers may occasionally revive, it is the harbinger of the upcoming autumn season. The receding rains leave behind a freshly washed cityscape, bathed in a golden hue under mild sunshine. Nights become relatively cooler, foreshadowing the advent of the winter season. There remains the occasional gust of wind, carrying the fragrance of Daaliyas, marking the flowering season.

Temperature

New Delhi notes an average high-temperature of a still sweltering 35°C (95°F) in September, hardly diverging from August. New Delhi in September anticipates an average nighttime temperature of 26.3°C (79.3°F).

Heat index

For most parts of September, the heat index is evaluated at a blisteringly hot 44°C (111.2°F). Be prepared: Heat cramps and heat exhaustion are probable. Continued activity may lead to heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are highly important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The average relative humidity in September is 57%.

Rainfall

In New Delhi, in September, it is raining for 10.2 days, with typically 49mm (1.93") of accumulated precipitation. Throughout the year, in New Delhi, there are 74.2 rainfall days, and 305mm (12.01") of precipitation is accumulated.

Daylight

In New Delhi, the average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 5:59 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 6:08 pm IST.

Sunshine

In September, the average sunshine is 9.1h.

UV index

In New Delhi, India, the average daily maximum UV index in September is 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 8 during September translates into the following directions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

How hot is it in New Delhi in September?

In New Delhi, 35°C (95°F) is the average high-temperature and 26.3°C (79.3°F) is the average low-temperature during September. In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 44°C (111.2°F).

What is the average humidity in September in New Delhi?

In New Delhi, India, the average relative humidity in September is 57%.

How much does it rain in New Delhi in September?

In September, in New Delhi, India, the rain falls for 10.2 days. Throughout September, 49mm (1.93") of precipitation is accumulated.

What is the average length of the day in September in New Delhi?

In September, the average day length in New Delhi is 12h and 20min.

When are sunrise and sunset in September in New Delhi?

In September, on the first day of the month, sunrise is at 5:59 am and sunset at 6:42 pm. On the last day of the month, in New Delhi, India, sunrise is at 6:13 am and sunset at 6:08 pm IST.

How many hours of sunshine does New Delhi have in September?

In September, the average sunshine duration is 9.1h.

What is the UV index reading in September in New Delhi?

In New Delhi, the average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to UV radiation.

Average temperature in September
New Delhi, India

Average temperature in September - New Delhi, India
  • Average high temperature in September: 35°C

The warmest month (with the highest average high temperature) is June (42.4°C).
The month with the lowest average high temperature is January (20.8°C).

  • Average low temperature in September: 26.3°C

The month with the highest average low temperature is June (32°C).
The coldest month (with the lowest average low temperature) is January (9.2°C).

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Average pressure in September
New Delhi, India

Average pressure in September - New Delhi, India
  • Average pressure in September: 1003.4mbar

The month with the highest atmospheric pressure is January (1017mbar).
The month with the lowest atmospheric pressure is June (996.7mbar).

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Average wind speed in September
New Delhi, India

Average wind speed in September - New Delhi, India
  • Average wind speed in September: 8.3km/h

The windiest month (with the highest average wind speed) is June (10.6km/h).
The calmest month (with the lowest average wind speed) is October (6.7km/h).

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Average humidity in September
New Delhi, India

Average humidity in September - New Delhi, India
  • Average humidity in September: 57%

The month with the highest relative humidity is August (62%).
The month with the lowest relative humidity is May (18%).

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Average rainfall in September
New Delhi, India

Average rainfall in September - New Delhi, India
  • Average rainfall in September: 49mm

The wettest month (with the highest rainfall) is July (86mm).
The driest month (with the least rainfall) is October (2mm).

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Average rainfall days in September
New Delhi, India

Average rainfall days in September - New Delhi, India
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is August (17.2 days).
The month with the least rainy days is November (1.2 days).

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Average daylight in September /
Average sunshine in September
New Delhi, India

Average daylight in September / Average sunshine in September - New Delhi, India
  • 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: 9h and 1min

The month with the most sunshine is May (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 7h and 18min).

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Average sunshine days in September
New Delhi, India

Average sunshine days in September - New Delhi, India
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is December (29.5 days).
The month with the least sunshine days is August (12.3 days).

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Average UV index in September
New Delhi, India

Average UV index in September - New Delhi, India
  • Average UV index in September: 8

The months with the highest UV index are April, May and June (UV index 9).
The month with the lowest UV index is December (UV index 4).

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Average cloud cover in September
New Delhi, India

Average cloud cover in September - New Delhi, India
  • Average cloud cover in September: 23

The month with the most cloud cover is August (Cloud cover 38).
The month with the least cloud cover is October (Cloud cover 5).

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Average visibility in September
New Delhi, India

Average visibility in September - New Delhi, India
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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New Delhi, India

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