September Weather in Longwantun, China

Last updated: August 22, 2025

In September, the average temperature in Longwantun, China hovers around 21°C (70°F), offering a pleasant climate for outdoor activities. However, be prepared for temperature fluctuations, as it can dip to a chilly 8°C (46°F) or soar to a warm 35°C (96°F). Expect about 59 mm (2.3 in) of precipitation over 6 days, contributing to an average humidity level of 74%. Whether you're exploring or relaxing, the weather in Longwantun this September has something for everyone!

September Temperature in Longwantun

In September in Longwantun, the average temperature is 21°C (70°F), with maximums reaching up to 35°C (96°F) and minimums dropping as low as 8°C (46°F). This makes it a great time to explore Longwantun, where you can enjoy warm days while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Longwantun, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longwantun, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (46°F).

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

September Precipitation in Longwantun

In Longwantun in September, the precipitation amount is 59 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in Longwantun

The chart displays monthly precipitation patterns in Longwantun, 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 Longwantun, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 6 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 Longwantun

In Longwantun in September humidity is 74%. With an average temperature of 21°C (70°F), this humidity feels like a warm, moist embrace, making outdoor activities both invigorating and slightly draining, so travelers should stay hydrated and take breaks often.

September Average Humidity in Longwantun

This chart illustrates the average monthly humidity levels in Longwantun, 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 Longwantun is approximately 74%, 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 Longwantun

In Longwantun 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 Longwantun.

Maximum UV Index Levels in Longwantun for September

The chart shows the monthly maximum UV Index (UVI) for Longwantun 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 Longwantun typically reaches 8, which falls under the very high exposure category.

Data source: Longwantun 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 Longwantun Compares to Other Months

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

This table compares monthly weather conditions in Longwantun, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	1 mm (0.1 inches)	65%	low
February Weather	-1°C (30°F)	7 mm (0.3 inches)	59%	moderate
March Weather	7°C (45°F)	15 mm (0.6 inches)	52%	moderate
April Weather	15°C (59°F)	20 mm (0.8 inches)	56%	very high
May Weather	21°C (71°F)	21 mm (0.8 inches)	56%	very high
June Weather	26°C (79°F)	41 mm (1.6 inches)	68%	very high
July Weather	27°C (81°F)	212 mm (8.4 inches)	78%	very high
August Weather	26°C (78°F)	135 mm (5.3 inches)	83%	very high
September Weather	21°C (70°F)	59 mm (2.3 inches)	74%	very high
October Weather	12°C (55°F)	31 mm (1.2 inches)	74%	high
November Weather	4°C (40°F)	16 mm (0.6 inches)	58%	moderate
December Weather	-3°C (27°F)	3 mm (0.1 inches)	60%	low