September weather forecast
Cầu Khởi, Vietnam

The first month of the autumn, September, is still a tropical month in Cầu Khởi, Vietnam, with temperature in the range of an average low of 25.1°C (77.2°F) and an average high of 31.7°C (89.1°F).

Temperature

The advent of September signifies a minor shift to an average high-temperature of a still tropical 31.7°C (89.1°F), aligning closely with August. The average low-temperature of 25.1°C (77.2°F) is witnessed during September.

Heat index

During September, the heat index is computed to be a blisteringly hot 43°C (109.4°F). Watchful: Heat cramps and heat exhaustion are predicted. Continued exertion could lead to heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is achieved by amalgamating air temperature with the relative humidity readings. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. 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. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The months with the highest humidity are September and October, with an average relative humidity of 79%.

Rainfall

The month with the most rainfall is September, when the rain falls for 28.4 days and typically aggregates up to 181mm (7.13") of precipitation.

Daylight

The average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:04. On the last day of September, sunrise is at 05:43 and sunset at 17:46 +07.

Sunshine

In September, the average sunshine is 7.7h.

UV index

The months with the lowest UV index are January, February, April through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 7 in September translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. 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. Enhance your sun protection with tightly woven, yet airy clothing.