Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Dehradun, India

The last month of the rainy (monsoon) season, September, is another warm month in Dehradun, India, with average temperature fluctuating between 20.8°C (69.4°F) and 29.7°C (85.5°F).


In September, the average high-temperature is essentially the same as in August - a still moderately hot 29.7°C (85.5°F). The average low-temperature, in September, 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 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', 'real feel', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, wind, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. 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.


In September, the average relative humidity is 81%.


In Dehradun, 296.5mm (11.7") of precipitation is typically accumulated. During the entire year, Dehradun aggregates up to 2208.9mm (87") of precipitation.


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

What is the temperature in September in Dehradun?

The average high-temperature, in September, is 29.7°C (85.5°F), while the average low-temperature is 20.8°C (69.4°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, is appraised 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?

During September, Dehradun regularly aggregates up to 296.5mm (11.7") of precipitation.

How many hours of daylight does Dehradun have in September?

The average length of the day in September in Dehradun is 12.3h.
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).

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%).

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 lowest rainfall) is November (8.6mm).

Average daylight in September - Dehradun, India
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with shortest days is December (Average daylight: 10.2h).