September weather forecast
Cổ Dương, Vietnam

September, the first month of the autumn in Cổ Dương, is still a tropical month, with an average temperature fluctuating between 24.2°C (75.6°F) and 31.7°C (89.1°F).

Temperature

Cổ Dương in September witnesses an average high-temperature of a still tropical 31.7°C (89.1°F), indicating a slight variation from August's 33.1°C (91.6°F). Throughout September, an average low-temperature of 24.2°C (75.6°F) is experienced.

Heat index

The heat index in September is estimated at a blisteringly hot 43°C (109.4°F). Be careful: Heat exhaustion and heat cramps are probable. Heatstroke may result from extended activity.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

August and September, with an average relative humidity of 80%, are the most humid months.

Rainfall

In Cổ Dương, during September, the rain falls for 18.5 days and regularly aggregates up to 73mm (2.87") of precipitation. In Cổ Dương, during the entire year, the rain falls for 181.2 days and collects up to 595mm (23.43") of precipitation.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of September, sunrise is at 05:40 and sunset at 18:12. On the last day of the month, sunrise is at 05:47 and sunset at 17:45 +07.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.