September weather forecast
Yên Nội, Vietnam

September, the first month of the autumn in Yênội, is still a hot month, with an average temperature varying between 23.2°C (73.8°F) and 30.9°C (87.6°F).

Temperature

September notes an average high-temperature of a still hot 30.9°C (87.6°F), subtly differing from August's 31.9°C (89.4°F). In September, Yênội's temperature tends to fall to an average low of 23.2°C (73.8°F) during the night.

Heat index

For September, the heat index is calculated to be a scorching 42°C (107.6°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The months with the highest humidity are August and September, with an average relative humidity of 83%.

Rainfall

In September, the rain falls for 22.4 days. Throughout September, 204mm (8.03") of precipitation is accumulated. In Yênội, during the entire year, the rain falls for 236.6 days and collects up to 1444mm (56.85") of precipitation.

Daylight

The average length of the day in September is 12h and 16min.
On the first day of September, sunrise is at 05:42 and sunset at 18:15. On the last day of the month, sunrise is at 05:50 and sunset at 17:48 +07.

Sunshine

In September, the average sunshine is 8.3h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Boost your sun resistance with garments that are densely woven yet spacious.