September Weather in Keyi, China

Last updated: August 22, 2025

In September, the average temperature in Keyi, China hovers around 12°C (54°F). Expect a range from a brisk -2°C (29°F) at its lowest to a pleasant 25°C (78°F) at its peak. With an average humidity of 54%, it's a great time to enjoy the mild conditions, even with a light 21 mm (0.8 in) of precipitation expected over about 5 days.

September Temperature in Keyi

In September in Keyi, the average temperature is 12°C (54°F). Maximum temperatures can reach up to 25°C (78°F), while minimums can drop as low as -2°C (29°F). This diverse temperature range makes it a great time for travelers to experience varied weather, so pack accordingly!

September Weather in Keyi: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Keyi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keyi, September typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (78°F) and lows dropping to around -2°C (29°F).

Data source: Temperature data for Keyi generated using information from the Copernicus Climate Change Service.

September Precipitation in Keyi

In Keyi in September, the precipitation amount is 21 mm (0.8 in) spread over a period of 5 days.

September Precipitation Trends in Keyi

The chart displays monthly precipitation patterns in Keyi, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Keyi, September typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 5 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Keyi

In Keyi in September humidity is 54%. With an average temperature of 12°C (54°F), this humidity feels like a cool, crisp embrace, making it pleasantly refreshing for travel while ensuring you stay comfortable as you explore the sights.

September Average Humidity in Keyi

This chart illustrates the average monthly humidity levels in Keyi, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Keyi is approximately 54%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Keyi

In Keyi in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Keyi.

Maximum UV Index Levels in Keyi for September

The chart shows the monthly maximum UV Index (UVI) for Keyi in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Keyi typically reaches 8, which falls under the very high exposure category.

Data source: Keyi September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Keyi Compares to Other Months

Weather in Keyi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Keyi, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Keyi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-12°C (10°F)	5 mm (0.2 inches)	89%	moderate
February Weather	-9°C (17°F)	12 mm (0.5 inches)	81%	moderate
March Weather	-1°C (31°F)	12 mm (0.5 inches)	70%	very high
April Weather	7°C (45°F)	37 mm (1.5 inches)	57%	very high
May Weather	13°C (55°F)	20 mm (0.8 inches)	53%	extreme
June Weather	15°C (60°F)	49 mm (1.9 inches)	49%	extreme
July Weather	18°C (65°F)	23 mm (0.9 inches)	51%	extreme
August Weather	16°C (62°F)	28 mm (1.1 inches)	52%	extreme
September Weather	12°C (54°F)	21 mm (0.8 inches)	54%	very high
October Weather	3°C (37°F)	22 mm (0.9 inches)	66%	high
November Weather	-5°C (24°F)	7 mm (0.3 inches)	71%	moderate
December Weather	-10°C (14°F)	2 mm (0.1 inches)	85%	low