September weather forecast
Hồng Ngự, Vietnam

September, the first month of the autumn in Hồngự, is still a tropical month, with an average temperature fluctuating between 31.5°C (88.7°F) and 25.4°C (77.7°F).

Temperature

September's onset records a minor alteration in the average high-temperature to a still tropical 31.5°C (88.7°F) from August's 32.3°C (90.1°F). Throughout September nights, Hồngự experiences a consistent temperature average of 25.4°C (77.7°F).

Heat index

The heat index in September is appraised at an extremely hot 42°C (107.6°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Hồngự, during September, the rain falls for 23.8 days and regularly aggregates up to 134mm (5.28") of precipitation. Throughout the year, there are 223 rainfall days, and 986mm (38.82") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 05:48 and sunset at 18:08. On the last day of September, sunrise is at 05:47 and sunset at 17:49 +07.

Sunshine

In Hồngự, Vietnam, the average sunshine in September is 8h.

UV index

The months with the lowest UV index are January, February, May through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 7 in September translates into these instructions:
Prevent overexposure. Protection from the sun's harmful effects is needed. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.