September weather forecast
Yên Nội, Vietnam

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

Temperature

Yênội's average high-temperature in September is a still hot 30.9°C (87.6°F), indicating a subtle variation from August. In the month of September, the average temperature dips to a moderately hot 23.2°C (73.8°F) during the night.

Heat index

For September, the heat index is computed to be a blisteringly hot 42°C (107.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', joins air temperature with relative humidity to produce a temperature perception for humans. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. 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 particularly meaningful for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

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

Rainfall

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

Daylight

In Yênội, Vietnam, the average length of the day in September is 12h and 16min.
On the first day of September in Yênội, 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 Yênội, the average sunshine in September is 8.3h.

UV index

In Yênội, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 6 during September translates into the following directions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.