September weather forecast
Rajbiraj, Nepal

September marks the decline of monsoon and ushers in a transition towards the drier part of the year. The substantial decrease in the amount of rainfall to 141mm (5.55"), combined with longer sunshine hours, signals the withdrawal of monsoon season. With the highest temperature dropping to 33.1°C (91.6°F), it carries the existing monsoon remains while preparing for the forthcoming autumn season. The diminishing cloud coverage and steadying of wind speed at around 10km/h (6.2mph), further underpin this seasonal transition. The Septembers in Rajbiraj offer travelers a solacing retreat, with the perfect mingling of clear skies and minimal showers.

Temperature

The onset of September brings with it an average high-temperature of a still tropical 33.1°C (91.6°F), showing a negligible variation from the month before. Throughout September, the average low-temperature in Rajbiraj dips to a moderately hot 25.6°C (78.1°F).

Heat index

In September, the average heat index is computed to be a blazing hot 45°C (113°F). Warning: Heat cramps and heat exhaustion are anticipated. Heatstroke is a risk with ongoing activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. 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 are particularly relevant to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The months with the highest humidity are July and September, with an average relative humidity of 73%.

Rainfall

In September, in Rajbiraj, the rain falls for 21.5 days. Throughout September, 141mm (5.55") of precipitation is accumulated. In Rajbiraj, during the entire year, the rain falls for 131.9 days and collects up to 787mm (30.98") of precipitation.

Daylight

In Rajbiraj, the average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 5:37 am and sunset at 6:17 pm. On the last day of September, in Rajbiraj, sunrise is at 5:50 am and sunset at 5:45 pm +0545.

Sunshine

The average sunshine in September in Rajbiraj is 8.5h.

UV index

The average daily maximum UV index in September in Rajbiraj is 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.