September weather forecast
Dehradun, India

September brings a sigh of relief as the monsoon begins to fade and the city reverts to a less rainy period. Weather patterns gradually lean back towards the warm and dry, similar to pre-monsoon months. The lingering humidity from the extensive monsoon period in August gradually decreases, bringing an end to damp days. Dewy mornings, limited rainfall and the revival of regular activities make September a delightful time in Dehradun. The weather in September allows for a complete exploration of nature's bounty that Dehradun is famous for.

Temperature

September in Dehradun notes an average high-temperature of a still warm 29.7°C (85.5°F), subtly differing from August's 29.4°C (84.9°F). An average minimum temperature of 20.8°C (69.4°F) is recorded in Dehradun during the month of September.

Heat index

In September, the average heat index is computed to be a very hot 37°C (98.6°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Heat index details are generally centered around shaded locations and a mild breeze. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gauges the sensation of temperature factoring in the air's moisture content. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

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

In September, the average length of the day in Dehradun is 12h and 21min.
On the first day of the month, sunrise is at 5:54 am and sunset at 6:40 pm. On the last day of September, in Dehradun, sunrise is at 6:10 am and sunset at 6:04 pm IST.