September Weather in Kowloon, Hong Kong

Last updated: August 21, 2025

September in Kowloon, Hong Kong, is characterized by warm temperatures, with a maximum of 32°C (91°F) and an average of 28°C (83°F), while the minimum dips to a comfortable 24°C (76°F). This month is also marked by significant precipitation, as it receives 223 mm (8.8 in) of rainfall over approximately 22 days, leading to a humid atmosphere averaging around 75%. Visitors should be prepared for sultry conditions mixed with frequent showers, making it essential to embrace the vibrant, lush scenery that the rain fosters in this bustling metropolis.

September Temperature in Kowloon

In Kowloon, Hong Kong, September marks the transition from the sweltering summer months into a slightly cooler autumn. With temperatures ranging from a minimum of 24°C (76°F) to a pleasant maximum of 32°C (91°F), the early signs of relief from the summer heat are evident. The average temperature rests at 28°C (83°F), maintaining the warmth characteristic of this vibrant city but hinting at the upcoming seasonal shift. As humidity begins to wane, September offers a more comfortable climate for exploration, making it a delightful time to experience Kowloon’s bustling streets and cultural attractions.

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

The chart illustrates September temperature patterns in Kowloon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kowloon, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec636369737983848382787265
Data source: Temperature data for Kowloon generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kowloon

In September, Kowloon experiences a notable shift in its precipitation patterns, garnering 223 mm (about 8.8 in) of rainfall across 22 days. This marks a decrease from the torrential downpours of August, which typically sees the highest rainfall of the year at 384 mm (15.1 in) over 25 days. As the summer monsoon begins to wane, September serves as a transitional month, featuring consistently wet weather that still supports lush greenery, but with somewhat reduced intensity. This trend hints at the gradual return to drier conditions as autumn approaches, with October's rainfall dropping to 189 mm (7.4 in) and only 10 days of precipitation. Overall, September encapsulates the tail end of the rainy season, blending lingering summer humidity with the early whispers of fall.

September Precipitation Trends in Kowloon

The chart displays monthly precipitation patterns in Kowloon, 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 Kowloon, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec215260931713252193842231893631
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Kowloon

In September, Kowloon, Hong Kong experiences a notable humidity level of 75%, indicating a slight decrease from the peak summer months of July and August, which both reach a high of 88%. This drop suggests a transition as the region moves from the sweltering summer heat towards the more temperate conditions of autumn. Throughout the year, humidity levels exhibit a clear trend: starting from a comfortable 64% in January, they gradually escalate to their highest points in the summer before tapering off as autumn arrives. September's humidity serves as a gentle reminder of the lingering warmth, yet signals the onset of cooler, more refreshing days ahead.

September Average Humidity in Kowloon

This chart illustrates the average monthly humidity levels in Kowloon, 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 Kowloon is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec64%68%73%71%79%77%88%88%75%65%64%69%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kowloon

As September rolls in Kowloon, the UV Index maintains its position in the "extreme" category with a notable score of 12, reflecting a slight decrease from the peak of 14 in May. This consistency signifies a sustained period of intense UV radiation, particularly through the summer months of June to August. With a burn time of only 10 minutes, it’s crucial for residents and visitors alike to protect their skin from potential harm. The trend shows that as the year progresses into October, the UV levels begin to taper down, but the sun still demands respect in these early autumn days. To stay informed and safe under the sun, be sure to check out Kowloon UV Index.

Maximum UV Index Levels in Kowloon for September

The chart shows the monthly maximum UV Index (UVI) for Kowloon 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 Kowloon typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710121214131313121197
Data source: Kowloon 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.

September Sunshine in Kowloon

As summer gracefully gives way to autumn, September in Kowloon shines with an impressive 288 hours of sunlight. This vibrant month contributes to the overall trend of increasing daylight hours, peaking in the sweltering heat of July at 323 hours. Following this zenith, September still boasts significant sunshine, offering a perfect balance of warmth without the peak summer intensity. This gradual decline continues into October, where the sun still graces the city with 280 hours, hinting at the inviting fall ambiance that starts to take over. With the days becoming shorter yet still sun-drenched, September strikes a harmonious note, inviting both locals and visitors to revel in Kowloon’s golden glow before the cooler months arrive.

Monthly Sunshine Duration in Kowloon: September Highlighted

The September sunshine duration represents the total number of hours Kowloon experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec216h251h274h263h301h274h323h280h288h280h262h264h
Data source: Kowloon September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kowloon During September

In Kowloon, Hong Kong, September brings a moderate likelihood of sunny weather, with a 45% chance of sunshine. This month stands as a notable improvement compared to the gloomy summer months, particularly June and August, where the chances plummet to 12% and 15% respectively. Following the heavy rains of summer, September often presents a welcome transition, marking a peak in sunshine potential as the city prepares for the cooler autumn months ahead. As October approaches, the chance of sunny days decreases slightly to 35%, but September offers a fleeting opportunity to enjoy the outdoors before the weather turns distinctly cooler.

Percentage of Sunny Days in September in Kowloon

The chart illustrates the percentage of sunny days in Kowloon throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Kowloon experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec61%60%43%42%30%12%31%15%45%36%62%50%
Data source: Kowloon September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kowloon in September

As September unfolds in Kowloon, Hong Kong, residents enjoy an inviting 12 hours of daylight, continuing a trend of extended light that begins in late spring. After the summer months, when daylight peaks at 13 hours, the gradual transition towards autumn sees a slight tapering off, mirroring the gradual shift from long, sun-drenched days to the cozy embrace of shorter daylight hours ahead. This month serves as a balance between the warmth of summer and the cooler embrace of fall, allowing for plenty of opportunities to bask in the beautiful outdoor spaces that the region has to offer before daylight starts to diminish further in the coming months.

Average Daylight Hours in Kowloon for September

The chart illustrates the variation in daylight duration in Kowloon throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 55m11h 23m12h 1m12h 39m13h 11m13h 27m13h 19m12h 51m12h 14m11h 36m11h 3m10h 46m
Data source: Kowloon daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kowloon

As summer begins to fade, September in Kowloon reveals a subtle shift in the breeze, characterized by an average wind speed of 3.2 m/s (7 mph). This gentle wind marks a decline from the breezier months of earlier summer, where speeds hovered around 3.4 m/s (8 mph) in August. The arrival of September signals the transition towards the more invigorating winds of autumn, setting the stage for October’s brisk average of 6.4 m/s (14 mph). This gradual decrease in wind speed throughout late summer reflects Kowloon’s climatic rhythm, making September a month of gentle caresses, where the city savors the last whispers of warmth before embracing the refreshing chill of fall.

Average September Wind Speed in Kowloon

The chart displays monthly wind speed patterns in Kowloon, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.14.44.74.63.74.23.83.43.2 m/s6.44.95.6
Data source: Kowloon September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kowloon Compares to Other Months

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

September and January exhibit stark contrasts in weather conditions. In September, temperatures range from a warm minimum of 24°C (76°F) to a peak of 32°C (91°F), with an average temperature of 28°C (83°F). This month is also characterized by significant rainfall, totaling 223 mm (8.8 in) over about 22 days, coupled with high humidity levels of 75%. In contrast, January offers a much cooler climate, with temperatures dipping to a low of 8°C (46°F) and a high of 24°C (75°F), averaging around 17°C (63°F). Precipitation is minimal during this month, with only 21 mm (0.8 in) over just 4 days and a lower humidity rate of 64%. For more detailed insights, you can check the Kowloon weather in January.

September and February present very contrasting weather patterns. In September, temperatures are warm, with a minimum of 24°C (76°F) and averages reaching 28°C (83°F), peaking at 32°C (91°F), while the humidity is relatively high at 75%. This month also sees significant rainfall, totaling 223 mm (8.8 in) over 22 days. In stark contrast, February experiences much cooler temperatures, ranging from a minimum of 7°C (45°F) to an average of 17°C (64°F) and a maximum of 24°C (76°F). Additionally, the precipitation is significantly lower at 52 mm (2.0 in) over just 7 days, with humidity at a more comfortable 68%. For further details on February conditions, you can refer to Kowloon weather in February.

When comparing the weather in September and March, a stark difference in temperatures and precipitation is evident. September boasts a warmer climate, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (91°F), while March experiences cooler conditions, with temperatures averaging between 12°C (54°F) and 27°C (80°F). Additionally, September is much wetter, receiving 223 mm (8.8 in) of rainfall over 22 days, compared to March's 60 mm (2.4 in) over just 10 days. The humidity remains relatively similar, with September at 75% and March slightly lower at 73%. For a more in-depth look at the weather specifics, you can check this link: Kowloon weather in March.

In comparing the weather between September and April, it’s clear that September is significantly warmer, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (91°F), compared to April's more moderate range of 14°C (58°F) to 29°C (85°F). Additionally, September tends to be considerably wetter, receiving 223 mm (8.8 in) of precipitation over 22 days, while April sees only 93 mm (3.7 in) across 12 days. Humidity levels are relatively similar, at 75% in September and 71% in April, but the overall climate feels more oppressive in the former due to higher temperatures and rainfall. For a detailed look at April's weather, you can check Kowloon weather in April.

In September, the weather is typically warm with a minimum temperature of 24°C (76°F) and an average high of 32°C (91°F), making it slightly hotter than May. However, the month is marked by significant rainfall, averaging 223 mm (8.8 in) over 22 days, contributing to a humidity level of 75%. In contrast, May features a milder temperature range with a minimum of 18°C (64°F) and an average high of 33°C (92°F), but less precipitation at 171 mm (6.7 in) across 18 days, resulting in higher humidity at 79%. For a more detailed look at May's weather, you can visit Kowloon weather in May.

In comparing the weather of September and June, we see that both months have similar average temperatures, with a minimum of 24°C (76°F) and an average of 28°C (83°F). However, June tends to be slightly warmer, with a maximum temperature reaching 33°C (91°F), while September peaks at 32°C (91°F). Precipitation levels are higher in June, with 325 mm (12.8 in) of rain over 24 days, compared to September's 223 mm (8.8 in) over 22 days. Humidity levels are also slightly elevated in June at 77%, compared to 75% in September. For a more detailed look at the conditions during June, you can refer to Kowloon weather in June.

In comparing the weather between September and July, we can see some notable differences. September has a slightly lower minimum temperature of 24°C (76°F) compared to July's 25°C (78°F) and averages a bit cooler at 28°C (83°F) versus July's 29°C (84°F). However, both months experience high maximum temperatures, with September reaching up to 32°C (91°F) and July a bit higher at 33°C (92°F). Precipitation is quite similar, with September receiving 223 mm (8.8 in) over 22 days, while July has slightly less at 219 mm (8.6 in) over 24 days. Additionally, humidity levels are higher in July at 88% compared to September's 75%, making July feel more muggy. For more insights on July weather patterns, you can check Kowloon weather in July.

In comparing the weather between August and September, September tends to be slightly cooler, with a minimum temperature of 24°C (76°F) compared to August's 26°C (78°F). Both months share the same average temperature of 28°C (83°F), but August peaks higher with a maximum of 34°C (93°F), whereas September's maximum is 32°C (91°F). Precipitation is significantly lower in September, with 223 mm (8.8 in) over 22 days, while August experiences heavier rainfall, totaling 384 mm (15.1 in) over 25 days. Additionally, humidity is higher in August at 88%, compared to September's 75%. For more details, visit Kowloon weather in August.

September and October weather exhibits notable differences that reflect the transition from late summer to early autumn. In September, temperatures are warmer, with a minimum of 24°C (76°F) and an average of 28°C (83°F), while October cools down slightly, featuring a minimum of 17°C (64°F) and an average of 26°C (78°F). Both months experience maximum temperatures reaching 32°C (91°F), but September is marked by higher humidity at 75% compared to October's 65%. Additionally, September sees more precipitation, totaling 223 mm (8.8 inches) over 22 days, whereas October has 189 mm (7.4 inches) spread over just 10 days, indicating drier conditions. For more specific information about October's climate, check out Kowloon weather in October.

In September, temperatures are notably warmer, ranging from a minimum of 24°C (76°F) to a maximum of 32°C (91°F) with an average of 28°C (83°F). This month also experiences significant rainfall, with 223 mm (8.8 in) of precipitation over 22 days and high humidity at 75%. In contrast, November brings a much cooler climate, with temperatures dropping to a minimum of 16°C (60°F) and peaking at 28°C (82°F), averaging 22°C (72°F). Rainfall is significantly lower in November, with only 36 mm (1.4 in) of precipitation across just 4 days, and humidity decreases to 64%. For more details on November weather, you can check Kowloon weather in November.

In September, the weather is warm and humid, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (91°F), and substantial rainfall of 223 mm (8.8 in) spread over 22 days. This month experiences a high humidity level of 75%, creating a tropical feel. In contrast, December sees a significant drop in temperatures, with an average range of 10°C (49°F) to 26°C (78°F). Rainfall is minimal during this month, totaling only 31 mm (1.2 in) over just 4 days, and humidity decreases to 69%. The weather in December is much cooler and drier, making it a more comfortable time for outdoor activities. For more details, visit Kowloon weather in December.

Compare Kowloon's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kowloon

As September unfolds in Kowloon, the warm embrace of summer lingers with temperatures often reaching a maximum of 32°C (91°F), while the evenings provide a comfortable respite at minimums around 24°C (76°F). This month stands out with a significant amount of rainfall, as it experiences frequent precipitation days that contribute to a higher humidity level of 75%. Unlike the drier months preceding it, September’s weather is a blend of heat and humidity, making it a unique transition towards autumn. For those interested in the broader climate trends, more detailed insights can be found at Kowloon Climate.