Hong Kong
Hong Kong in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Hong Kong in September is climatically well suited to beach holidays. The average daily high is around 30 °C, and the sea is about 28 °C. With about 17 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
59/100 · #9
Warmth
#3
Dryness
#8
Sun
#3
Sea warmth
#3
Published best categories: none
Hong Kong · SeptemberPhoto: Diliff · CC BY-SA 3.0Climate facts
- Average high
- 30 °C
- Average low
- 26 °C
- Sea
- 28 °C
- Rainy days (est.)
- 17 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 30 | 27 | 23 | 276 | 6.3 | 85 | 3.1 | 29 | 53 |
| September (selected) | 30 | 26 | 17 | 180 | 6.0 | 82 | 3.3 | 28 | 59 |
| October | 28 | 22 | 7 | 57 | 5.6 | 77 | 3.8 | 27 | 84 |
How do the previous and next months compare?
Baseline: September (59/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -6 | +0.3 °C | +1.2 °C | +6.3 | +95.3 mm | +0.3 h | +3.5 % | -0.2 m/s | +0.3 °C |
| October | +25 | -1.8 °C | -3.3 °C | -10.1 | -123.1 mm | -0.4 h | -5.1 % | +0.6 m/s | -1.6 °C |
All twelve months in context
Find a place to stay
Where to stay in Hong Kong
Compare available stays, prices and cancellation terms for Hong Kong on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Frequently asked questions
How warm is Hong Kong in September?
The average daily high is around 30 °C, with an average daily low of about 26 °C.
Can you swim in Hong Kong in September?
The sea is about 28 °C (very warm).
Does it rain a lot in Hong Kong in September?
The curated estimate is about 17 rainy days per month, not a directly measured long-term average. Total precipitation averages around 180 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Hong Kong?
By the climate score, March, October, November and December are the strongest months for Hong Kong. For a beach trip: April, May, October and November. September is not among them.