yearsofweather

Hong Kong in September:
properly hot,

Hong Kong · Records from 2006 to 2025. Not a forecast.

Mean high31°Hottest day 35.3° (2008)
Mean low26°Coldest night 21° (2006)
Rain days12 days6-18 by year
Rainfall358mmDaylight 12.6 → 12.0 h
Hong Kong's 12 months iBest: March, November and December
Trip types Beach Finewarm sea, frequent rain and storm riskSightseeing on foot Finehot, frequent rain, muggy and storm risk
Humidity80%29 muggy days
Clear days5 days11 overcast days
Mean wind10 km/hRarely windy
Sea temperature28.8°27.7-29.2° by year (last 6)
Sunrise / sunset (15th)06:10 / 18:27Daylight 12.6 → 12.0 h

Hong Kong in September

Typhoon season is not over. The Mid-Autumn Festival is on the fifteenth day of the eighth lunar month, between mid-September and early October, with a lantern event in Victoria Park. In Tai Hang the fire dragon dance runs over three nights.

Days averaged 31°C and nights 26°C. Midday was for air conditioning, a cold drink or a long lunch out of the sun. The gap between day and night was just 5°C, so it felt much the same around the clock. About 12 days a month saw rain, enough that a wet-weather plan was worth having. The average is 12, but individual years ran from 6 (2012) to 18 (2017).

The wet season was winding down: 12 rain days in September, then 6 in October. Highs topped 30°C on 20 days of the month on average. Mixing in indoor stops at midday made sense. Rain days averaged 29 mm each, so when it rained it rained properly.

Typhoons i

7 of the last 20 years had a tropical storm pass within 300 km this month.

  • Saola (2023), 36 km away typhoon strength
  • Usagi (2013), 88 km away typhoon strength
  • Mangkhut (2018), 109 km away typhoon strength
1 2 3 14 15 86 67 128 79 310 411 112

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 58% of days31° 27°
5-11rain on 50% of days31° 26°
12-18rain on 39% of days31° 26°
19-25rain on 38% of days30° 26°
26-30rain on 22% of days31° 26°

0-5/206-8/209-11/2012-20/20

1-4rain on 58% of days31° 27°
5-11rain on 50% of days31° 26°
12-18rain on 39% of days31° 26°
19-25rain on 38% of days30° 26°
26-30rain on 22% of days31° 26°
Tap another date to change

20067mm
2007none
20083mm
2009none
2010none
2011none
20124mm
2013none
20143mm
201525mm
201674mm
20171mm
201819mm
20199mm
202018mm
20213mm
202230mm
202388mm
202422mm
202545mm
Holidays in September (2027)
  • September 16 The day following the Chinese Mid-Autumn Festival
  • September 6 Labor Day

1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
6 d 12 d
2007
1 d 8 d
2008
3 d 13 d
2009
2 d 11 d
2010
5 d 17 d
2011
0 d 12 d
2012
2 d 6 d
2013
1 d 12 d
2014
4 d 10 d
2015
1 d 9 d
2016
7 d 13 d
2017
6 d 18 d
2018
3 d 11 d
2019
2 d 7 d
2020
5 d 18 d
2021
3 d 13 d
2022
3 d 7 d
2023
7 d 17 d
2024
5 d 16 d
2025
4 d 15 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
11
12
12
11
12
9
15
11
9
8
6
8
8
8
8
9
9
4
6
7
7
8
10
10
5
3
1
5
8
5
Rain days on trip
61325021417632533754

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2012 had 6 rain days, 2017 had 18.

Hong Kong through the year

MonthHighLowRain daysRainfallSea
January 19°15°3 days34mm 19°
February 20°15°4 days37mm 19°
MarchGood 22°18°6 days83mm 21°
April 26°21°8 days157mm 23°
May 29°25°12 days318mm 27°
June 31°27°17 days486mm 28°
July 32°27°15 days361mm 30°
August 31°27°16 days416mm 29°
September 31°26°12 days358mm 29°
October 28°24°6 days203mm 28°
NovemberGood 25°20°4 days56mm 24°
DecemberGood 21°16°3 days23mm 21°

Common questions

Does it rain a lot in Hong Kong in September?

Over the past 20 years September averaged 12 rain days (1 mm or more) out of 30. Individual years ran from 6 in the driest to 18 in the wettest.

What should I wear in Hong Kong in September?

Days averaged 31°C and nights 26°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.

Can you swim in Hong Kong in September?

Sea surface temperature averaged 28.8°C in September, warm enough to stay in for a long swim. Year to year it ranged 27.7-29.2°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Hong Kong?

On warmth and rain days alone, Hong Kong's easiest months were March, November and December. September ranked 9 of 12.

Is Hong Kong humid in September?

Mean relative humidity was 80%, with about 29 muggy days (dew point of 20°C or more) in the month.