Weather in Hong Kong for September 2025
In general, the average temperature in Hong Kong at the beginning of September is 29.3 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 29.1 °C by the end of September.
Hong Kong experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
Is September a good time to visit Hong Kong? check out the best time to travel to Hong Kong page.
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Hong Kong in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  30° | 3  30° | 4 31° | 5 30° | 6 27° | 7 28° |
| 8 27° | 9 28° | 10 27° | 11 27° | 12  29° | 13 29° | 14  29° |
| 15 29° | 16  29° | 17 30° | 18  29° | 19 30° | 20 30° | 21 30° |
| 22 29° | 23 27° | 24 27° | 25 29° | 26 29° | 27 30° | 28 29° |
| 29 30° | 30 30° |
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Temperatures trend during September in Hong Kong
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 29° /25° | 101.5 mm | 7 | |
| 2 Sept. | Torrential rain shower | 30° /26° | 81.9 mm | 7 | |
| 3 Sept. | Moderate or heavy rain shower | 30° /26° | 15.8 mm | 7 | |
| 4 Sept. | Light rain shower | 31° /27° | 3.3 mm | 7 | |
| 5 Sept. | Patchy rain possible | 30° /27° | 5 mm | 7 | |
| 6 Sept. | Light rain shower | 27° /25° | 40 mm | 6 | |
| 7 Sept. | Moderate or heavy rain shower | 28° /26° | 23 mm | 6 | |
| 8 Sept. | Light rain shower | 27° /24° | 26 mm | 6 | |
| 9 Sept. | Light rain shower | 28° /25° | 12.4 mm | 6 | |
| 10 Sept. | Moderate or heavy rain shower | 27° /25° | 44.6 mm | 6 | |
| 11 Sept. | Moderate or heavy rain shower | 27° /26° | 51.7 mm | 6 | |
| 12 Sept. | Partly cloudy | 29° /25° | 0.2 mm | 7 | |
| 13 Sept. | Partly cloudy | 29° /26° | 2 mm | 7 | |
| 14 Sept. | Cloudy | 29° /26° | 5.8 mm | 6 | |
| 15 Sept. | Cloudy | 29° /25° | 0.9 mm | 6 | |
| 16 Sept. | Patchy light drizzle | 29° /26° | 2 mm | 7 | |
| 17 Sept. | Patchy light drizzle | 30° /26° | 8.5 mm | 7 | |
| 18 Sept. | Thundery outbreaks possible | 29° /26° | 2.2 mm | 7 | |
| 19 Sept. | Patchy rain possible | 30° /26° | 1.2 mm | 7 | |
| 20 Sept. | Patchy rain possible | 30° /26° | 2.1 mm | 7 | |
| 21 Sept. | Patchy rain possible | 30° /25° | 13.2 mm | 7 | |
| 22 Sept. | Patchy rain possible | 29° /24° | 5.3 mm | 6 | |
| 23 Sept. | Partly cloudy | 27° /23° | 9.1 mm | 6 | |
| 24 Sept. | Patchy rain possible | 27° /24° | 5.8 mm | 6 | |
| 25 Sept. | Patchy rain possible | 29° /25° | 1.7 mm | 6 | |
| 26 Sept. | Patchy rain possible | 29° /26° | 0.5 mm | 6 | |
| 27 Sept. | Patchy rain possible | 30° /26° | 2.4 mm | 7 | |
| 28 Sept. | Patchy rain possible | 29° /27° | 6.2 mm | 6 | |
| 29 Sept. | Patchy rain possible | 30° /26° | 1.2 mm | 7 | |
| 30 Sept. | Patchy rain possible | 30° /26° | 1.6 mm | 7 | |
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Guide for Hong Kong in September
In September, Hong Kong experiences a transition from the hot and humid summer to the cooler and more comfortable autumn. At the beginning of the month, the weather in Hong Kong is still quite warm and humid, with temperatures averaging around 28° during the day and 25° at night.
The city also experiences occasional rain showers and thunderstorms, which contribute to the high humidity levels.
As the month progresses, the weather gradually becomes more pleasant, with slightly lower temperatures and less humidity. By the end of September, the average daytime temperature in Hong Kong drops to around 26°, while the nighttime temperatures decrease to about 23°.
The frequency of rain showers also decreases towards the end of the month, leading to clearer skies and more sunshine.
Overall, September is a transitional month for Hong Kong, with the weather shifting from the hot and rainy conditions of summer to the milder and drier weather of autumn.
Travelers visiting Hong Kong during this time can expect warm days, cooler nights, and a mix of sunny and rainy weather, making it important to pack accordingly for varying conditions.
Hong Kong in September - FAQ
What to pack to Hong Kong in September?
As you prepare for your trip to Hong Kong in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Hong Kong, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
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