Hong Kong Weather in September
Hong Kong · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Hong Kong sees average temperatures ranging from a low of 25.0°C (77.0°F) to a high of 29.3°C (84.7°F), with a mean of 26.9°C (80.4°F). Compared to the annual average of 22.5°C (72.5°F), this month is 4.4°C warmer than the yearly norm. Precipitation averages 338.4mm, making it approximately 143.0mm wetter than the monthly average of 196.0mm. The city receives an average of 8.9 hours of sunshine per day during September, with relative humidity averaging 86.8%. Wind speeds reach an average maximum of 16.2 km/h. For travelers, this month offers a temperature experience in Hong Kong, with wetter-than-average conditions compared to the rest of the year.
There's something about Hong Kong in autumn that the summer crowds never experience. October-November brings 25°C, low humidity, clear skies — and the city exhales after typhoon season. I hiked Dragon's Back in November and the South China Sea sparkled below. Summer is a different beast: 33°C with 90% humidity, the air thick enough to chew. Typhoons (July-September) are dramatic cultural events — shops shutter, signals fly, everyone watches the news. Lunar New Year (January-February) brings a festive energy despite the 16°C chill. Spring is humid and gloomy; autumn is the city's gift to itself.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 27.3°C (81.1°F) | 26.9°C (80.4°F) | 24.2°C (75.6°F) |
| Rainfall | 379.4mm | 338.4mm | 211.5mm |
| Sunshine | 8.9 hrs | 8.9 hrs | 8.6 hrs |
| Humidity | 88.8% | 86.8% | 75.8% |
| Wind | 16.5 km/h | 16.2 km/h | 21.6 km/h |
| Rainy Days | 30.0 | 27.6 | 15.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Hong Kong in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Hong Kong in September?
The average temperature in Hong Kong during September ranges from 25.0°C (77.0°F) to 29.3°C (84.7°F), with a mean of 26.9°C (80.4°F).
How much does it rain in Hong Kong in September?
Hong Kong receives an average of 338.4mm of precipitation in September, spread across approximately 27.6 rainy days.
What should I pack for Hong Kong in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 338.4mm of precipitation.
Is September a good time to visit Hong Kong?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Hong Kong
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 22.32°, 114.17°. Timezone: Asia/Hong_Kong. Last updated: 2026-07-30.