September weather forecast
Tulsipur, Nepal

As September rolls in, rainfall gradually begins to taper off, marking the end of monsoon and the beginning of autumn. With weather conditions transitioning, September retains its hot but pleasant climate while making way for cooler days. The humidity levels recede and the gradual fall in temperature begins to set in. The drop in rainfall also sees a decrease in cloud cover, contributing to clearer skies and enhanced visibility. The slight crescendo in wind speeds, with gusts touching 13.7km/h (8.5mph), adds to the freshness of the autumn air.

Temperature

The arrival of September is marked by an average high-temperature of a still hot 33.6°C (92.5°F), bearing a close resemblance to August. Tulsipur's average low-temperature during September nights is observed to be a warm 24.7°C (76.5°F).

Heat index

During September, the heat index is computed to be a burning hot 46°C (114.8°F). Prudent: Heat cramps and heat exhaustion are likely. Heatstroke becomes imminent with sustained exertion.
Heat index's context suggests values are appropriate for shady areas and slight breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially crucial for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The months with the highest humidity are August and September, with an average relative humidity of 71%.

Rainfall

In September, the rain falls for 14.5 days. Throughout September, 73mm (2.87") of precipitation is accumulated. Throughout the year, there are 88.5 rainfall days, and 530mm (20.87") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 5:54 am and sunset at 6:36 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 6:02 pm +0545.

Sunshine

The average sunshine in September is 10h.

UV index

The average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 7 suggests this advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.