Hong Kong weather in September
September in Hong Kong: sweltering, soaked, with very humid — a fair time to visit.
#10 of 12 months in Hong Kong · #562 of 604 destinations to visit in September · comfort 51/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Hong Kong climate normals — September
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 224 mm / 8.8 in | ⛈ soaked |
| Rainy days | 20 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.3 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 84 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hong Kong in September — FAQ
- Is September a good time to visit Hong Kong?
- September in Hong Kong: sweltering, soaked, with very humid — a fair time to visit. It ranks #10 of 12 months for Hong Kong on SeasonMap's comfort score (51/100).
- What is the weather like in Hong Kong in September?
- In September, Hong Kong averages a daily high of 29.8°C and a low of 26°C, with about 223.8 mm of rain over roughly 19.6 rainy days.
- What is the air quality in Hong Kong in September?
- Hong Kong has a mean US Air Quality Index of about 84 in September.