30YearWeather
Hong Kong in September
Hong Kong weather in September - Hong Kong
🌧️Wet Season

Hong Kong Weather in September

Plan your September trip to Hong Kong, Hong Kong. Based on 30 years of NASA data, expect temperatures of 29°C (high) to 25°C (low), with 49% rain probability and 8 hours of daily sunshine. The South China Sea averages 29°C in September. Pack rain gear for around 30 rainy days.

Avg High
29°C

Hottest around day 3

Avg Low
25°C

Coolest around day 22

Rainy Days
30days

49% avg rain chance

Sunshine
8hrs/day

Autumn season

Sea Temperature in September

South China Sea(南海)

28.5°C

Monthly Average

Water Feel
🌴Tropical

Perfect for swimming and water sports

Swim Rating
Excellent for swimming

Based on average sea surface temperature

Body of Water
South China Sea

南海

Hong Kong coastline

Hong Kong September Weather Calendar

Click any day to see detailed weather information

Currency

HKD

$ Hong Kong dollar

Language

English

+1 more

Driving

Left side

Connect

Postal services are provided byHongkong ...

Travel Intelligence

Exclusive flight analytics & health data for Hong Kong

Smart Flight Estimator

Airport-to-Airport Logistics

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Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
100/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Mar

Monthly Traffic Distribution

461
Jan
472
Feb
460
Mar
472
Apr
492
May
971
Jun
1039
Jul
1138
Aug
967
Sep
1004
Oct
779
Nov
1115
Dec
Traffic Level
Low Season

Key Connections

Taipei Taiwan Taoyuan (TPE)
Shanghai Pudong (PVG)
Bangkok Suvarnabhumi (BKK)
Tokyo Narita (NRT)
Manila Ninoy Aquino (MNL)

Is September a Good Time to Visit Hong Kong?

👌Decent conditions for most activities
Short Answer

Storm season alert for Hong Kong in September: beyond the 29°C, 49% rain averages, hurricane risk requires travel insurance and schedule flexibility.

Decision Factors

Typhoon season active

Western Pacific zone - expect potential typhoon activity

Oppressive heat and humidity

29.4°C with 84% humidity - challenging conditions

Feels significantly hotter than 29.4°C

Heat index: 37°C due to 84% humidity

Warm tropical seas

28.5°C sea temperature - Tropical Bath

Poor air quality: Unhealthy

Unhealthy. Everyone should reduce outdoor activities.

Frequent rainfall expected

49% chance of rain - pack waterproofs

Good For

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

  • 👴
    Elderly travelers

    Heat index of 37°C poses health risks

  • 💼
    Business travelers

    Storm season may cause flight disruptions

  • 🌡️
    Heat-sensitive visitors

    37°C feels-like temperature creates discomfort

900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Hong Kong in September averages 29°C with 49% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Hong Kong in September

What are the temperatures in Hong Kong in September?

Daytime highs average 29°C, nights drop to 25°C. Temperatures remain fairly consistent.

How many rainy days in Hong Kong in September?

Expect around 30 days with measurable rainfall. An umbrella is advisable.

What to wear in Hong Kong in September?

Light, breathable fabrics. Don't forget sunglasses and a hat.

Is September peak season in Hong Kong?

This is off-peak season. Expect lower prices and fewer crowds.