September weather forecast
Dehradun, India

Weather in September

September, the last month of the rainy (monsoon) season in Dehradun, is also a moderately hot month, with an average temperature fluctuating between 29.7°C (85.5°F) and 20.8°C (69.4°F).

Temperature

In Dehradun, the average high-temperature in September is practically the same as in August - a still moderately hot 29.7°C (85.5°F). In September, in Dehradun, the average low-temperature is 20.8°C (69.4°F).

Heat index

In September, the average heat index is evaluated at a torrid 37°C (98.6°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 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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, differences in body mass, height, and shape, clothing, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In Dehradun, the average relative humidity in September is 81%.

Rainfall

During September, Dehradun regularly aggregates up to 297mm (11.69") of precipitation. During the entire year, Dehradun aggregates up to 2209mm (86.97") of precipitation.

Daylight

The average length of the day in September in Dehradun is 12h and 21min.
On the first day of the month, sunrise is at 5:54 am and sunset at 6:41 pm. On the last day of September, sunrise is at 6:10 am and sunset at 6:05 pm IST.
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FAQ

What is the temperature in September in Dehradun?

In September, in Dehradun, the average high-temperature is 29.7°C (85.5°F), and the average low-temperature is 20.8°C (69.4°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in September is evaluated at 37°C (98.6°F).

What is the average humidity in September in Dehradun?

In Dehradun, India, the average relative humidity in September is 81%.

How much does it rain in Dehradun in September?

In Dehradun, in September, 297mm (11.69") of precipitation is typically accumulated.

How many hours of daylight does Dehradun have in September?

In Dehradun, the average day length in September is 12h and 21min.

When is the sunrise / sunset in September in Dehradun?

On the first day of September in Dehradun, India, sunrise is at 5:54 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 6:05 pm IST.

Average temperature in September
Dehradun, India

Average temperature in September - Dehradun, India
  • Average high temperature in September: 29.7°C

The warmest month (with the highest average high temperature) is May (35.6°C).
The month with the lowest average high temperature is January (19.3°C).

  • Average low temperature in September: 20.8°C

The month with the highest average low temperature is June (23°C).
The coldest month (with the lowest average low temperature) is January (6°C).

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Average humidity in September
Dehradun, India

Average humidity in September - Dehradun, India
  • Average humidity in September: 81%

The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is April (46%).

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Average rainfall in September
Dehradun, India

Average rainfall in September - Dehradun, India
  • Average rainfall in September: 296.5mm

The wettest month (with the highest rainfall) is August (728.2mm).
The driest month (with the least rainfall) is November (8.6mm).

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Average daylight in September
Dehradun, India

Average daylight in September - Dehradun, India
  • Average daylight in September: 12h and 21min

The month with the longest days is June (Average daylight: 14h and 4min).
The month with the shortest days is December (Average daylight: 10h and 14min).

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