September weather forecast
Taipei, Taiwan

The advent of September paves the way for a transition from summer to autumn in Taipei, thus welcoming a downward slide in temperatures. September brings a reprieve from the deluge observed in August, though not significantly. The duration of daylight recedes further, preparing to embrace the shorter days of autumn. Nevertheless, sun lovers would leaf through their fond memories of summer, given the plentiful sunshine hours still available. This month demands vigilant sun protection measures, courtesy of the lingering UV index of 10.

Temperature

The arrival of September in Taipei brings an average high-temperature of a still hot 31.1°C (88°F), closely following the temperature pattern of August. Taipei records a steady low-temperature average of 24.8°C (76.6°F) during September.

Heat index

In September, the average heat index is estimated at an extremely hot 40°C (104°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly important for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in September in Taipei is 75.8%.

Rainfall

September is the month with the most rainfall. Rain falls for 13.8 days and accumulates 361mm (14.21") of precipitation.

Daylight

In September, the average length of the day in Taipei is 12h and 18min.
On the first day of September, sunrise is at 05:34 and sunset at 18:12. On the last day of the month, sunrise is at 05:45 and sunset at 17:41 CST.

Sunshine

In Taipei, the average sunshine in September is 5.1h.

UV index

The average daily maximum UV index in September in Taipei is 10. A UV Index value of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 10 in September transforms into this advice:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Applying and reapplying liberally a broad-spectrum sunscreen of SPF 30+ every two hours, and straight after a swim or outdoor activity is recommended.