September weather forecast
Xi'an, China

The arrival of September rings in the autumn season in Xi'an. It brings cooler temperatures that deviate notably from August’s hotter conditions. However, September experiences a substantial amount of rainfall, which surpasses that of August, over more frequent rain days. Despite the reduction in daylight hours and a lower UV index, the weather remains fairly bright. In general, September's moderate climate and cloudy weather set the transition to the cooler weather in October.

Temperature

September's onset brings a reduction in the average high-temperature, from a hot 30.8°C (87.4°F) in August to a moderately hot 25.3°C (77.5°F). The average nighttime temperature in Xi'an lowers to a mild 15.9°C (60.6°F) throughout September.

Humidity

With an average relative humidity of 79%, September is the most humid month in Xi'an.

Rainfall

In Xi'an, in September, it is raining for 10.9 days, with typically 92mm (3.62") of accumulated precipitation. Throughout the year, in Xi'an, there are 90.3 rainfall days, and 553mm (21.77") of precipitation is accumulated.

Daylight

In Xi'an, the average length of the day in September is 12h and 24min.
On the first day of September in Xi'an, sunrise is at 06:17 and sunset at 19:10. On the last day of the month, sunrise is at 06:38 and sunset at 18:30 CST.

Sunshine

The average sunshine in September in Xi'an is 4.2h.

UV index

The average daily maximum UV index in September in Xi'an, China, is 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, an average UV index of 8 transforms into the following instructions:
Be proactive in protecting yourself; skin and eyes can be harmed if left unprotected. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.