September weather forecast
New Delhi, India

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.