Hong Kong Hong Kong Weather in September — Climate Guide
September in Hong Kong is Good
September is Good for Hong Kong.
September is shoulder transition — slightly cooler 30°C/25°C, humidity drops to 78%, typhoon frequency reduces. **Mid-Autumn Festival** (variable, around mid-September) is family BBQ + lantern + mooncake holiday — Victoria Park hosts lantern displays (free). Hotel prices drop 30% from August.
Travel score
Summer end + typhoon tail + avoid Korean Chuseok week
September Weather at a Glance
September averages 86°F / 30°C highs and 77°F / 25°C lows — summer tail. Humidity 78% + 13 rainy days, 280mm. Typhoon season ends late September. Mid-Autumn Festival (varies by year, traditional lanterns + mooncakes).
September Travel Advice
Short sleeves + light cardigan + folding umbrella. Late September begins autumn. Mid-Autumn Festival (varies by year, September-October) Victoria Park lantern festival. Korean Chuseok 1-week fare spikes.
Flying In from Overseas
Korean Chuseok (varies by year, mid-September to early October) — Asia-Hong Kong $420-840 round-trip. Post-Chuseok is the value window $280-490.
September Pricing Trends
Chuseok week 1.5-2x — TST 3-star $195-350/night. Post-Chuseok $125-225.
Hong Kong September Weather Stats
Avg High
30°C
Avg Low
25°C
Rainy Days
12
308mm total
Sunshine
5.5h
Daily avg
Humidity
78%
Warm humid
UV Index
8
Very high
Wind
13 km/h
Gusts 25
Sea Temp
27°C
Avg water temp
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
32 μg/m³
PM10
48 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
33°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
13 km/h
Max gust 25 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Mid-Autumn Festival cultural moment
- Hotel prices drop 30%
- Last beach weeks
- Mooncake season
Cons
- Still hot + humid
- Late typhoons possible
- Mid-Autumn 3-day weekend hotel spike
September Events & Festivals
- Mid-Autumn Festival (variable, Sept-Oct)
- Mooncake season peak
- Lantern festivals
Hong Kong in September — Full Picture
September is shoulder transition — slightly cooler 30°C/25°C, humidity drops to 78%, typhoon frequency reduces. **Mid-Autumn Festival** (variable, around mid-September) is family BBQ + lantern + mooncake holiday — Victoria Park hosts lantern displays (free). Hotel prices drop 30% from August.
What to Wear & What to Pack
Late summer — t-shirts + shorts during day, light cardigan evening. Humidity dropping slightly. Sunscreen + umbrella.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
24°C
19.3°C
9.7/mo
Summer (Jun·Jul·Aug)
30.7°C
26°C
14/mo
Autumn (Sep·Oct·Nov)
Current27.3°C
22.3°C
7/mo
Winter (Dec·Jan·Feb)
18.7°C
14.7°C
3.7/mo
Hong Kong Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 18° | 14° | 3d·23mm | 4.5h | 73% | 4 | Moderate | Shoulder |
| 18° | 14° | 5d·50mm | 3.5h | 78% | 4 | Busy | Peak | |
| 20° | 16° | 7d·80mm | 3h | 82% | 5 | Moderate | Shoulder | |
| 24° | 19° | 10d·137mm | 3.5h | 84% | 7 | Moderate | Shoulder | |
| 28° | 23° | 12d·290mm | 4.5h | 84% | 9 | Moderate | Shoulder | |
| 30° | 26° | 13d·392mm | 5h | 84% | 10 | Busy | Peak | |
| 31° | 26° | 14d·374mm | 6h | 82% | 10 | Very busy | Peak | |
| 31° | 26° | 15d·444mm | 6h | 81% | 10 | Very busy | Peak | |
| 30° | 25° | 12d·308mm | 5.5h | 78% | 8 | Busy | Shoulder | |
| October (Best) | 28° | 23° | 6d·100mm | 6h | 73% | 7 | Very busy | Peak |
| November (Best) | 24° | 19° | 3d·35mm | 5h | 70% | 5 | Busy | Shoulder |
| 20° | 16° | 3d·27mm | 4.5h | 70% | 4 | Very busy | Peak |
View Other Months
Hong Kong September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Hong Kong?
Hong Kong in September is Good. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Hong Kong in September?
Hong Kong September averages a high of 30°C and a low of 25°C.
Does it rain much in Hong Kong in September?
Hong Kong September averages 308mm of rainfall over about 12 rainy days.
What should I wear in Hong Kong in September?
Late summer — t-shirts + shorts during day, light cardigan evening. Humidity dropping slightly. Sunscreen + umbrella.
What time are sunrise and sunset in Hong Kong in September?
Hong Kong September sunrise is 06:10 and sunset is 18:20, with 12h 10m of daylight.
What's the air quality like in Hong Kong in September?
Hong Kong September air quality (AQI) averages 68, rated Moderate. PM2.5 averages 32μg/m³.
What activities are recommended in Hong Kong in September?
In September, Hong Kong is great for Mid-Autumn lantern displays, Victoria Park lanterns, Late beach trip.
Is September peak season in Hong Kong?
Hong Kong September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Hong Kong
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.