September weather forecast
Tainan, Taiwan

September in Tainan typically sees the end of the wet season, ushering in a period of transition towards drier months. The city witnesses a gradual decline in rainfall, dropping to an average of 178mm (7.01"). This, however, does not translate into a stark drop in humidity or temperatures, which remain quite high. September's weather is a mix of lingering wet season traits and the onset of drier and slightly cooler conditions that hint towards the arrival of fall.

Temperature

Tainan's shift from August to September is accompanied by an average high-temperature of a still tropical 32°C (89.6°F), a slight deviation from 32.5°C (90.5°F). Tainan's nights in September experience an average temperature drop to a warm 25.3°C (77.5°F).

Heat index

For most parts of September, the heat index is computed to be a blisteringly hot 44°C (111.2°F). Stay wary: Heat exhaustion and heat cramps are possible. Heatstroke can ensue from extended effort.
Keep in mind the heat index values are meant for areas in shade and with light wind. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September in Tainan is 78.2%.

Rainfall

In Tainan, in September, during 9.5 rainfall days, 178mm (7.01") of precipitation is typically accumulated. Throughout the year, there are 87.4 rainfall days, and 1698mm (66.85") of precipitation is accumulated.

Sea temperature

In Tainan, in September, the average water temperature is 28.8°C (83.8°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

The average length of the day in September in Tainan is 12h and 17min.
On the first day of the month, sunrise is at 05:41 and sunset at 18:16. On the last day of September, in Tainan, sunrise is at 05:50 and sunset at 17:47 CST.

Sunshine

The average sunshine in September in Tainan is 6h.

UV index

In September, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a regular UV index of 11 translates into these guidelines:
Employ every precaution of importance, unprotected skin and eyes could burn within moments. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Enhance your sun protection with tightly woven, yet airy clothing. Even on overcast days, a sunscreen with a sun protection factor of no less than 30 should be generously applied and reapplied, particularly after swimming or outdoor activities. Stay cautious! Sand and water reflections increase UV radiation potency.