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September Weather in Helong, China

Last updated: August 22, 2025

In September, the average temperature in Helong, China hovers around 14°C (58°F). Expect a range that can dip as low as -1°C (30°F) and soar up to 27°C (81°F). With 86 mm (3.4 in) of precipitation over approximately 10 days, the month brings a notable amount of rain. Additionally, the average humidity is a high 84%, creating a rich and moist atmosphere.

September Temperature in Helong

In September in Helong, the average temperature is 14°C (58°F), with maximums reaching up to 27°C (81°F) and minimums dropping as low as -1°C (30°F). This variation in temperature makes it essential to pack layers to stay comfortable while exploring the outdoor attractions.

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

The chart illustrates September temperature patterns in Helong, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helong, September typically has an average temperature of 14°C (58°F), with highs reaching up to 27°C (81°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec71229435461706857432711
Data source: Temperature data for Helong generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Helong

In Helong in September, the precipitation amount is 86 mm (3.4 in) over the course of 10 days.

September Precipitation Trends in Helong

The chart displays monthly precipitation patterns in Helong, 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 Helong, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec923344310411812920586423614
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Helong

In Helong in September humidity is 84%. With an average temperature of 14°C (58°F), this humidity feels like a heavy blanket enveloping you, making every step feel sluggish and damp, which can be uncomfortable for traveling.

September Average Humidity in Helong

This chart illustrates the average monthly humidity levels in Helong, 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 Helong is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%75%70%65%72%82%87%89%84%83%67%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Helong

In Helong 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 Helong.

Maximum UV Index Levels in Helong for September

The chart shows the monthly maximum UV Index (UVI) for Helong 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 Helong typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246891011118632
Data source: Helong 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 Helong Compares to Other Months

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

This table compares monthly weather conditions in Helong, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-14°C (7°F)8 mm (0.3 inches)78%low
February Weather-11°C (13°F)23 mm (0.9 inches)75%moderate
March Weather-1°C (30°F)34 mm (1.3 inches)70%high
April Weather6°C (43°F)43 mm (1.7 inches)65%very high
May Weather12°C (54°F)104 mm (4.1 inches)72%very high
June Weather16°C (62°F)118 mm (4.6 inches)82%very high
July Weather21°C (70°F)129 mm (5.1 inches)87%extreme
August Weather20°C (68°F)205 mm (8.1 inches)89%extreme
September Weather14°C (58°F)86 mm (3.4 inches)84%very high
October Weather6°C (43°F)42 mm (1.7 inches)83%high
November Weather-3°C (28°F)36 mm (1.4 inches)67%moderate
December Weather-12°C (11°F)14 mm (0.5 inches)70%low

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