Hong Kong in September
In September, Hong Kong averages 30°C (86°F) during the day and 25°C (77°F) at night, with frequent rain — about 14 days of the month see precipitation (325 mm total).
Off-peakConditions are warm and beach-friendly. Plan for unsettled weather and bring rain gear.
It's peak typhoon season in Hong Kong during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Hong Kong
September is in the middle of the year for warmth in Hong Kong (4th of 12) and moderately rainy compared to the rest of the year (5th of 12). Daytime temperature runs 5°C above the annual average (25°C). September runs 1°C cooler than August (31°C) and cools 2°C in October (28°C).
September sunrise & sunset in Hong Kong
Times shown for Hong Kong local time (Asia/Hong_Kong), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Hong Kong — September
Golden-hour and blue-hour windows for the 15th of September, in Hong Kong's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Hong Kong in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Off-peak) and Hong Kong's popularity.
Crowds & pricing — September in Hong Kong
This is off-peak for Hong Kong — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: peak hazard season (1 active)
Sun & mosquito risk — September in Hong Kong
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Hong Kong — September
Across the year Hong Kong's sea swings from 18.6°C (January) to 29.3°C (July) — September sits at 28.2°C.
Hong Kong in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 18°C / 64°F | 14°C / 57°F | 25 mm | 5 | — |
| February | 19°C / 66°F | 15°C / 59°F | 55 mm | 9 | — |
| March | 21°C / 70°F | 17°C / 63°F | 85 mm | 11 | — |
| April | 25°C / 77°F | 20°C / 68°F | 165 mm | 12 | — |
| May | 28°C / 82°F | 23°C / 73°F | 295 mm | 15 | — |
| June | 30°C / 86°F | 26°C / 79°F | 395 mm | 19 | — |
| July | 31°C / 88°F | 26°C / 79°F | 375 mm | 17 | — |
| August | 31°C / 88°F | 26°C / 79°F | 450 mm | 17 | — |
| September | 30°C / 86°F | 25°C / 77°F | 325 mm | 14 | — |
| October | 28°C / 82°F | 22°C / 72°F | 100 mm | 7 | — |
| November | 24°C / 75°F | 18°C / 64°F | 40 mm | 5 | — |
| December | 20°C / 68°F | 15°C / 59°F | 25 mm | 4 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Hong Kong in September →
Frequently asked questions
How hot is Hong Kong in September?
In September, Hong Kong averages a high of 30°C (86°F) and a low of 25°C (77°F) — generally hot.
Does it rain a lot in Hong Kong in September?
September can be fairly wet in Hong Kong, with about 14 rainy days on average.
Is September a good time to visit Hong Kong?
September is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Hong Kong in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Hong Kong for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.