Cheung Chau weather in September
In September, Cheung Chau sees average daytime highs of 30°C and overnight lows near 26°C, with 204 mm of rain across 16.6 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.
Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels miserable.
Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Cheung Chau's 5th-clearest and 11th-windiest month. For the whole year in context, see Cheung Chau's year-round climate.
- Daytime high
- 30°
- 3rd warmest
- Overnight low
- 26°
- 9th coldest
- Rainfall
- 204 mm
- 16.6 wet days
- Daylight
- 12 h 06 min
- 6:14 AM – 6:22 PM
- Cloud cover
- 60%
- 5th clearest
- Wind
- 13 km/h
- 11th windiest
- Solar energy
- 5.12 kWh/m²
- Travel score
- 4.3
- out of 10
Temperature in September
Day-to-day highs hold fairly steady near 30°C through the month.
A typical September day in Cheung Chau reaches about 30°C in the afternoon and slips back to 26°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 |
| Avg low (°C) | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 27 |
| 2 | 30 | 27 |
| 3 | 30 | 26 |
| 4 | 30 | 26 |
| 5 | 30 | 26 |
| 6 | 30 | 26 |
| 7 | 30 | 26 |
| 8 | 30 | 26 |
| 9 | 30 | 26 |
| 10 | 30 | 26 |
| 11 | 30 | 26 |
| 12 | 30 | 26 |
| 13 | 30 | 26 |
| 14 | 30 | 26 |
| 15 | 30 | 26 |
| 16 | 30 | 26 |
| 17 | 30 | 26 |
| 18 | 30 | 26 |
| 19 | 30 | 26 |
| 20 | 30 | 26 |
| 21 | 30 | 26 |
| 22 | 30 | 26 |
| 23 | 30 | 26 |
| 24 | 30 | 26 |
| 25 | 30 | 26 |
| 26 | 29 | 25 |
| 27 | 29 | 25 |
| 28 | 29 | 25 |
| 29 | 29 | 25 |
| 30 | 29 | 25 |
How September really feels in Cheung Chau
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Cheung Chau weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 19° / 14° | 24 | 4.1 | 10.8 | 7.0 |
| Feb | 20° / 15° | 34 | 6.4 | 11.2 | 6.5 |
| Mar | 22° / 18° | 58 | 9.4 | 11.8 | 6.5 |
| Apr | 25° / 21° | 107 | 12.7 | 12.5 | 6.1 |
| May | 28° / 25° | 209 | 17.9 | 13 | 4.7 |
| Jun | 30° / 27° | 302 | 22.5 | 13.3 | 3.4 |
| Jul | 31° / 27° | 247 | 21.2 | 13.2 | 3.4 |
| Aug | 31° / 27° | 312 | 22.7 | 12.8 | 3.3 |
| Sep | 30° / 26° | 204 | 16.6 | 12.1 | 4.3 |
| Oct | 28° / 24° | 70 | 6.7 | 11.5 | 6.9 |
| Nov | 24° / 20° | 34 | 4.7 | 10.9 | 8.0 |
| Dec | 20° / 16° | 29 | 3.8 | 10.7 | 7.5 |
Cloud cover in September
The sky is clear or mostly clear about 34% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 36 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 44 | 45 | 47 | 48 | 50 | 51 | 52 | 54 | 54 | 55 | 56 | 57 | 57 | 58 | 58 | 59 | 59 | 61 | 61 | 62 | 63 | 63 |
| Cloudier (%) | 64 | 64 | 63 | 62 | 61 | 60 | 59 | 58 | 56 | 55 | 53 | 52 | 50 | 49 | 48 | 46 | 46 | 45 | 44 | 43 | 43 | 42 | 42 | 41 | 41 | 39 | 39 | 38 | 37 | 37 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 36 | 64 |
| 2 | 36 | 64 |
| 3 | 37 | 63 |
| 4 | 38 | 62 |
| 5 | 39 | 61 |
| 6 | 40 | 60 |
| 7 | 41 | 59 |
| 8 | 42 | 58 |
| 9 | 44 | 56 |
| 10 | 45 | 55 |
| 11 | 47 | 53 |
| 12 | 48 | 52 |
| 13 | 50 | 50 |
| 14 | 51 | 49 |
| 15 | 52 | 48 |
| 16 | 54 | 46 |
| 17 | 54 | 46 |
| 18 | 55 | 45 |
| 19 | 56 | 44 |
| 20 | 57 | 43 |
| 21 | 57 | 43 |
| 22 | 58 | 42 |
| 23 | 58 | 42 |
| 24 | 59 | 41 |
| 25 | 59 | 41 |
| 26 | 61 | 39 |
| 27 | 61 | 39 |
| 28 | 62 | 38 |
| 29 | 63 | 37 |
| 30 | 63 | 37 |
Chance of precipitation in September
Cheung Chau gets around 204 mm of rain over 16.6 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 55% and peaks near 69% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 69 | 69 | 68 | 67 | 67 | 66 | 65 | 64 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 53 | 52 | 50 | 49 | 48 | 47 | 46 | 44 | 43 | 42 | 41 | 40 | 39 | 38 |
| Rain chance (%) | |
|---|---|
| 1 | 69 |
| 2 | 69 |
| 3 | 68 |
| 4 | 67 |
| 5 | 67 |
| 6 | 66 |
| 7 | 65 |
| 8 | 64 |
| 9 | 63 |
| 10 | 62 |
| 11 | 61 |
| 12 | 60 |
| 13 | 58 |
| 14 | 57 |
| 15 | 55 |
| 16 | 54 |
| 17 | 53 |
| 18 | 52 |
| 19 | 50 |
| 20 | 49 |
| 21 | 48 |
| 22 | 47 |
| 23 | 46 |
| 24 | 44 |
| 25 | 43 |
| 26 | 42 |
| 27 | 41 |
| 28 | 40 |
| 29 | 39 |
| 30 | 38 |
Humidity in September
Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the miserable band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| Muggy (%) | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 19 | 20 | 22 | 23 |
| Oppressive (%) | 8 | 9 | 11 | 12 | 14 | 16 | 17 | 19 | 21 | 22 | 24 | 26 | 27 | 29 | 30 | 32 | 33 | 35 | 37 | 38 | 40 | 42 | 43 | 45 | 46 | 47 | 48 | 49 | 49 | 49 |
| Miserable (%) | 91 | 90 | 88 | 87 | 84 | 82 | 80 | 78 | 75 | 73 | 70 | 68 | 66 | 63 | 60 | 57 | 55 | 52 | 49 | 46 | 44 | 41 | 38 | 36 | 33 | 31 | 29 | 27 | 25 | 23 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 8 | 91 |
| 2 | 0 | 0 | 1 | 9 | 90 |
| 3 | 0 | 0 | 1 | 11 | 88 |
| 4 | 0 | 0 | 1 | 12 | 87 |
| 5 | 0 | 0 | 2 | 14 | 84 |
| 6 | 0 | 0 | 2 | 16 | 82 |
| 7 | 0 | 0 | 3 | 17 | 80 |
| 8 | 0 | 0 | 3 | 19 | 78 |
| 9 | 0 | 1 | 3 | 21 | 75 |
| 10 | 0 | 1 | 4 | 22 | 73 |
| 11 | 0 | 1 | 5 | 24 | 70 |
| 12 | 0 | 1 | 5 | 26 | 68 |
| 13 | 0 | 1 | 6 | 27 | 66 |
| 14 | 0 | 1 | 7 | 29 | 63 |
| 15 | 0 | 2 | 8 | 30 | 60 |
| 16 | 0 | 2 | 9 | 32 | 57 |
| 17 | 0 | 2 | 10 | 33 | 55 |
| 18 | 0 | 2 | 11 | 35 | 52 |
| 19 | 0 | 2 | 12 | 37 | 49 |
| 20 | 0 | 2 | 13 | 38 | 46 |
| 21 | 0 | 2 | 14 | 40 | 44 |
| 22 | 0 | 2 | 15 | 42 | 41 |
| 23 | 0 | 2 | 16 | 43 | 38 |
| 24 | 1 | 2 | 17 | 45 | 36 |
| 25 | 1 | 2 | 18 | 46 | 33 |
| 26 | 1 | 2 | 19 | 47 | 31 |
| 27 | 1 | 3 | 19 | 48 | 29 |
| 28 | 1 | 3 | 20 | 49 | 27 |
| 29 | 2 | 3 | 22 | 49 | 25 |
| 30 | 2 | 3 | 23 | 49 | 23 |
Wind in September
Winds average 13 km/h in September.
Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Feels | calm | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 12 | calm |
| 2 | 12 | calm |
| 3 | 12 | calm |
| 4 | 12 | calm |
| 5 | 12 | calm |
| 6 | 12 | calm |
| 7 | 12 | light breeze |
| 8 | 12 | light breeze |
| 9 | 12 | light breeze |
| 10 | 12 | light breeze |
| 11 | 13 | light breeze |
| 12 | 13 | light breeze |
| 13 | 13 | light breeze |
| 14 | 13 | light breeze |
| 15 | 13 | light breeze |
| 16 | 13 | light breeze |
| 17 | 13 | light breeze |
| 18 | 14 | light breeze |
| 19 | 14 | light breeze |
| 20 | 14 | light breeze |
| 21 | 14 | light breeze |
| 22 | 14 | light breeze |
| 23 | 14 | light breeze |
| 24 | 14 | light breeze |
| 25 | 14 | light breeze |
| 26 | 14 | light breeze |
| 27 | 14 | light breeze |
| 28 | 14 | light breeze |
| 29 | 14 | light breeze |
| 30 | 14 | light breeze |
Sunrise & sunset in September
Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over September. Sunrise moves from 6:10 AM to 6:19 AM, and sunset from 6:37 PM to 6:08 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunrise (AM) | 6:10 | 6:10 | 6:11 | 6:11 | 6:11 | 6:12 | 6:12 | 6:12 | 6:12 | 6:13 | 6:13 | 6:13 | 6:14 | 6:14 | 6:14 | 6:14 | 6:15 | 6:15 | 6:15 | 6:16 | 6:16 | 6:16 | 6:16 | 6:17 | 6:17 | 6:17 | 6:18 | 6:18 | 6:18 | 6:19 |
| Sunset (PM) | 6:37 | 6:36 | 6:35 | 6:34 | 6:33 | 6:32 | 6:31 | 6:30 | 6:29 | 6:28 | 6:27 | 6:26 | 6:25 | 6:24 | 6:23 | 6:22 | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:10 | 6:09 | 6:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:10 | 6:37 |
| 2 | 12.4 | 6:10 | 6:36 |
| 3 | 12.4 | 6:11 | 6:35 |
| 4 | 12.4 | 6:11 | 6:34 |
| 5 | 12.4 | 6:11 | 6:33 |
| 6 | 12.3 | 6:12 | 6:32 |
| 7 | 12.3 | 6:12 | 6:31 |
| 8 | 12.3 | 6:12 | 6:30 |
| 9 | 12.3 | 6:12 | 6:29 |
| 10 | 12.3 | 6:13 | 6:28 |
| 11 | 12.2 | 6:13 | 6:27 |
| 12 | 12.2 | 6:13 | 6:26 |
| 13 | 12.2 | 6:14 | 6:25 |
| 14 | 12.2 | 6:14 | 6:24 |
| 15 | 12.1 | 6:14 | 6:23 |
| 16 | 12.1 | 6:14 | 6:22 |
| 17 | 12.1 | 6:15 | 6:21 |
| 18 | 12.1 | 6:15 | 6:20 |
| 19 | 12.1 | 6:15 | 6:19 |
| 20 | 12.0 | 6:16 | 6:18 |
| 21 | 12.0 | 6:16 | 6:17 |
| 22 | 12.0 | 6:16 | 6:16 |
| 23 | 12.0 | 6:16 | 6:15 |
| 24 | 12.0 | 6:17 | 6:14 |
| 25 | 11.9 | 6:17 | 6:13 |
| 26 | 11.9 | 6:17 | 6:12 |
| 27 | 11.9 | 6:18 | 6:11 |
| 28 | 11.9 | 6:18 | 6:10 |
| 29 | 11.8 | 6:18 | 6:09 |
| 30 | 11.8 | 6:19 | 6:08 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.12 kWh/m².
For context, solar energy here swings from a low near 3.41 kWh/m² to a high of 5.67 kWh/m² in July across the year — September's 5.12 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.2 | Bright |
| 2 | 5.2 | Bright |
| 3 | 5.2 | Bright |
| 4 | 5.2 | Bright |
| 5 | 5.2 | Bright |
| 6 | 5.2 | Bright |
| 7 | 5.2 | Bright |
| 8 | 5.2 | Bright |
| 9 | 5.2 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.2 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.2 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.2 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.1 | Bright |
| 23 | 5.1 | Bright |
| 24 | 5.1 | Bright |
| 25 | 5.1 | Bright |
| 26 | 5.1 | Bright |
| 27 | 5.1 | Bright |
| 28 | 5.1 | Bright |
| 29 | 5.0 | Bright |
| 30 | 5.0 | Bright |
Hazard calendar for Cheung Chau
In September, Cheung Chau sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Cheung Chau sits in the Pacific typhoon belt; the season peaks July–October.
Cheung Chau's monsoon runs May–September, when most of the year's rain falls.
Is September a good time to visit Cheung Chau?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Cheung Chau for sightseeing.
What to pack for Cheung Chau in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Cheung Chau sees daytime highs around 30°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.
Sea temperature near Cheung Chau in September
The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 14 km away) is warmest in August at about 29°C and coldest in January near 20°C.
It's comfortable for a long swim from Feb 26 to Jan 6 — about 10.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 20 | 20 | 21 | 23 | 26 | 28 | 29 | 29 | 28 | 27 | 24 | 21 |
| Comfort | Cool | Cool | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 20 | Cool |
| Feb | 20 | Cool |
| Mar | 21 | Refreshing |
| Apr | 23 | Refreshing |
| May | 26 | Warm |
| Jun | 28 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 28 | Tropical |
| Oct | 27 | Warm |
| Nov | 24 | Refreshing |
| Dec | 21 | Refreshing |
UV index in Cheung Chau in September
Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Cheung Chau peaks around July 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 6 | 8 | 9 | 9 | 10 | 12 | 12 | 11 | 10 | 8 | 7 | 6 |
| Level | High | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 8 | Very high |
| Mar | 9 | Very high |
| Apr | 9 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Cheung Chau in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Cheung Chau is worst in January — around 183 µg/m³ PM2.5 (very unhealthy), about 2.5× the cleanest month (July, 73 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 183 | 175 | 165 | 149 | 115 | 83 | 73 | 85 | 119 | 127 | 157 | 156 |
| Level | Very unhealthy | Very unhealthy | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 183 | Very unhealthy |
| Feb | 175 | Very unhealthy |
| Mar | 165 | Very unhealthy |
| Apr | 149 | Unhealthy |
| May | 115 | Unhealthy |
| Jun | 83 | Unhealthy |
| Jul | 73 | Unhealthy |
| Aug | 85 | Unhealthy |
| Sep | 119 | Unhealthy |
| Oct | 127 | Unhealthy |
| Nov | 157 | Very unhealthy |
| Dec | 156 | Very unhealthy |
Where is Cheung Chau?
Cheung Chau sits at 22.2°N, 114.0°E, 4 m above sea level, in Hong Kong. The nearest listed city is Discovery Bay, 10 km away.
Topography around Cheung Chau
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cheung Chau.
Within 3 km, the terrain around Cheung Chau has only modest variations in elevation — a maximum elevation change of 219 m around an average of 8 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 913 m; within 80 km, large variations in elevation — a maximum elevation change of 984 m.
The land around Cheung Chau is covered by water (85%) within 3 km, water (76%) within 16 km, and water (66%) within 80 km.
Hong Kong travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 220 V · 50 Hz
- Prices
- ≈ 71% of US
- price level, 2025
- GDP per capita
- $56,983
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.4
- per 100k, 2023
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 538
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Cheung Chau (22.2109°, 114.0279°, elevation 4 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).