Caotun weather in September
In September, Caotun sees average daytime highs of 29°C and overnight lows near 23°C, with 230 mm of rain across 21.3 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Caotun's 8th-clearest and 11th-windiest month. For the whole year in context, see Caotun's year-round climate.
- Daytime high
- 29°
- 4th warmest
- Overnight low
- 23°
- 10th coldest
- Rainfall
- 230 mm
- 21.3 wet days
- Daylight
- 12 h 06 min
- 5:47 AM – 5:56 PM
- Cloud cover
- 65%
- 8th clearest
- Wind
- 4 km/h
- 11th windiest
- Solar energy
- 4.64 kWh/m²
- Travel score
- 3.9
- out of 10
Temperature in September
Day-to-day highs hold fairly steady near 29°C through the month.
A typical September day in Caotun reaches about 29°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°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 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 23 |
| 2 | 30 | 23 |
| 3 | 30 | 23 |
| 4 | 30 | 23 |
| 5 | 30 | 23 |
| 6 | 30 | 23 |
| 7 | 30 | 23 |
| 8 | 29 | 23 |
| 9 | 29 | 23 |
| 10 | 29 | 23 |
| 11 | 29 | 23 |
| 12 | 29 | 23 |
| 13 | 29 | 23 |
| 14 | 29 | 23 |
| 15 | 29 | 23 |
| 16 | 29 | 23 |
| 17 | 29 | 23 |
| 18 | 29 | 23 |
| 19 | 29 | 23 |
| 20 | 29 | 23 |
| 21 | 29 | 23 |
| 22 | 29 | 23 |
| 23 | 29 | 23 |
| 24 | 29 | 23 |
| 25 | 29 | 22 |
| 26 | 29 | 22 |
| 27 | 29 | 22 |
| 28 | 29 | 22 |
| 29 | 29 | 22 |
| 30 | 29 | 22 |
How September really feels in Caotun
Once humidity and wind are folded in, September averages 19 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.
Caotun weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 21° / 13° | 59 | 9.8 | 10.7 | 6.7 |
| Feb | 21° / 14° | 75 | 10.6 | 11.2 | 6.5 |
| Mar | 23° / 16° | 99 | 12.4 | 11.8 | 6.6 |
| Apr | 26° / 19° | 115 | 13.5 | 12.5 | 6.2 |
| May | 28° / 21° | 165 | 17.3 | 13.1 | 5.0 |
| Jun | 29° / 23° | 215 | 19.7 | 13.5 | 3.8 |
| Jul | 30° / 23° | 309 | 22.4 | 13.3 | 3.4 |
| Aug | 30° / 23° | 384 | 25.8 | 12.8 | 3.2 |
| Sep | 29° / 23° | 230 | 21.3 | 12.1 | 3.9 |
| Oct | 28° / 21° | 92 | 11.1 | 11.4 | 6.2 |
| Nov | 26° / 18° | 46 | 7.1 | 10.8 | 7.5 |
| Dec | 22° / 15° | 56 | 8.3 | 10.5 | 7.4 |
Cloud cover in September
The sky is clear or mostly clear about 20% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 57%. 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 (%) | 27 | 28 | 27 | 28 | 30 | 30 | 31 | 32 | 34 | 35 | 36 | 39 | 40 | 41 | 44 | 44 | 46 | 46 | 49 | 49 | 50 | 51 | 52 | 52 | 53 | 55 | 55 | 56 | 57 | 58 |
| Cloudier (%) | 73 | 72 | 73 | 72 | 70 | 70 | 69 | 68 | 66 | 65 | 64 | 61 | 60 | 59 | 56 | 56 | 54 | 54 | 51 | 51 | 50 | 49 | 48 | 48 | 47 | 45 | 45 | 44 | 43 | 42 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 27 | 73 |
| 2 | 28 | 72 |
| 3 | 27 | 73 |
| 4 | 28 | 72 |
| 5 | 30 | 70 |
| 6 | 30 | 70 |
| 7 | 31 | 69 |
| 8 | 32 | 68 |
| 9 | 34 | 66 |
| 10 | 35 | 65 |
| 11 | 36 | 64 |
| 12 | 39 | 61 |
| 13 | 40 | 60 |
| 14 | 41 | 59 |
| 15 | 44 | 56 |
| 16 | 44 | 56 |
| 17 | 46 | 54 |
| 18 | 46 | 54 |
| 19 | 49 | 51 |
| 20 | 49 | 51 |
| 21 | 50 | 50 |
| 22 | 51 | 49 |
| 23 | 52 | 48 |
| 24 | 52 | 48 |
| 25 | 53 | 47 |
| 26 | 55 | 45 |
| 27 | 55 | 45 |
| 28 | 56 | 44 |
| 29 | 57 | 43 |
| 30 | 58 | 42 |
Chance of precipitation in September
Caotun gets around 230 mm of rain over 21.3 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 71% and peaks near 79% 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 (%) | 79 | 79 | 79 | 78 | 78 | 78 | 78 | 77 | 77 | 76 | 76 | 75 | 74 | 73 | 72 | 71 | 70 | 68 | 67 | 67 | 66 | 65 | 64 | 64 | 63 | 62 | 62 | 61 | 60 | 59 |
| Rain chance (%) | |
|---|---|
| 1 | 79 |
| 2 | 79 |
| 3 | 79 |
| 4 | 78 |
| 5 | 78 |
| 6 | 78 |
| 7 | 78 |
| 8 | 77 |
| 9 | 77 |
| 10 | 76 |
| 11 | 76 |
| 12 | 75 |
| 13 | 74 |
| 14 | 73 |
| 15 | 72 |
| 16 | 71 |
| 17 | 70 |
| 18 | 68 |
| 19 | 67 |
| 20 | 67 |
| 21 | 66 |
| 22 | 65 |
| 23 | 64 |
| 24 | 64 |
| 25 | 63 |
| 26 | 62 |
| 27 | 62 |
| 28 | 61 |
| 29 | 60 |
| 30 | 59 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 96% 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 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| Humid (%) | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 |
| Muggy (%) | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 12 | 13 | 14 | 16 | 17 | 19 | 20 | 22 | 24 | 25 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 33 | 34 | 34 | 35 | 36 |
| Oppressive (%) | 89 | 88 | 88 | 87 | 88 | 87 | 87 | 86 | 86 | 84 | 83 | 81 | 79 | 77 | 76 | 74 | 72 | 71 | 69 | 67 | 66 | 65 | 64 | 63 | 61 | 60 | 59 | 58 | 57 | 55 |
| Miserable (%) | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 8 | 89 | 3 |
| 2 | 0 | 1 | 9 | 88 | 2 |
| 3 | 0 | 1 | 9 | 88 | 2 |
| 4 | 0 | 1 | 10 | 87 | 2 |
| 5 | 0 | 1 | 10 | 88 | 1 |
| 6 | 0 | 1 | 11 | 87 | 1 |
| 7 | 0 | 1 | 11 | 87 | 1 |
| 8 | 0 | 1 | 12 | 86 | 1 |
| 9 | 0 | 1 | 12 | 86 | 1 |
| 10 | 0 | 2 | 13 | 84 | 1 |
| 11 | 0 | 2 | 14 | 83 | 1 |
| 12 | 0 | 2 | 16 | 81 | 1 |
| 13 | 0 | 3 | 17 | 79 | 1 |
| 14 | 0 | 3 | 19 | 77 | 1 |
| 15 | 0 | 3 | 20 | 76 | 1 |
| 16 | 0 | 3 | 22 | 74 | 1 |
| 17 | 0 | 3 | 24 | 72 | 1 |
| 18 | 0 | 3 | 25 | 71 | 1 |
| 19 | 0 | 3 | 27 | 69 | 1 |
| 20 | 0 | 4 | 28 | 67 | 1 |
| 21 | 0 | 4 | 29 | 66 | 1 |
| 22 | 0 | 4 | 30 | 65 | 1 |
| 23 | 0 | 4 | 31 | 64 | 1 |
| 24 | 0 | 5 | 32 | 63 | 0 |
| 25 | 1 | 5 | 33 | 61 | 0 |
| 26 | 1 | 6 | 33 | 60 | 0 |
| 27 | 1 | 6 | 34 | 59 | 0 |
| 28 | 1 | 7 | 34 | 58 | 0 |
| 29 | 1 | 7 | 35 | 57 | 0 |
| 30 | 1 | 8 | 36 | 55 | 0 |
Wind in September
Winds average 4 km/h in September.
Across September, daily wind ranges from about 4 km/h on the calmest days to 5 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) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 5:42 AM to 5:52 AM, and sunset from 6:12 PM to 5:41 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) | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunrise (AM) | 5:42 | 5:43 | 5:43 | 5:43 | 5:44 | 5:44 | 5:44 | 5:45 | 5:45 | 5:45 | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:47 | 5:48 | 5:48 | 5:48 | 5:49 | 5:49 | 5:50 | 5:50 | 5:50 | 5:51 | 5:51 | 5:51 | 5:52 | 5:52 | 5:52 |
| Sunset (PM) | 6:12 | 6:11 | 6:10 | 6:09 | 6:08 | 6:06 | 6:05 | 6:04 | 6:03 | 6:02 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:55 | 5:54 | 5:52 | 5:51 | 5:50 | 5:49 | 5:48 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:42 | 5:41 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 5:42 | 6:12 |
| 2 | 12.5 | 5:43 | 6:11 |
| 3 | 12.4 | 5:43 | 6:10 |
| 4 | 12.4 | 5:43 | 6:09 |
| 5 | 12.4 | 5:44 | 6:08 |
| 6 | 12.4 | 5:44 | 6:06 |
| 7 | 12.4 | 5:44 | 6:05 |
| 8 | 12.3 | 5:45 | 6:04 |
| 9 | 12.3 | 5:45 | 6:03 |
| 10 | 12.3 | 5:45 | 6:02 |
| 11 | 12.3 | 5:46 | 6:01 |
| 12 | 12.2 | 5:46 | 6:00 |
| 13 | 12.2 | 5:46 | 5:59 |
| 14 | 12.2 | 5:47 | 5:58 |
| 15 | 12.2 | 5:47 | 5:57 |
| 16 | 12.1 | 5:47 | 5:56 |
| 17 | 12.1 | 5:48 | 5:55 |
| 18 | 12.1 | 5:48 | 5:54 |
| 19 | 12.1 | 5:48 | 5:52 |
| 20 | 12.0 | 5:49 | 5:51 |
| 21 | 12.0 | 5:49 | 5:50 |
| 22 | 12.0 | 5:50 | 5:49 |
| 23 | 12.0 | 5:50 | 5:48 |
| 24 | 11.9 | 5:50 | 5:47 |
| 25 | 11.9 | 5:51 | 5:46 |
| 26 | 11.9 | 5:51 | 5:45 |
| 27 | 11.9 | 5:51 | 5:44 |
| 28 | 11.9 | 5:52 | 5:43 |
| 29 | 11.8 | 5:52 | 5:42 |
| 30 | 11.8 | 5:52 | 5:41 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.64 kWh/m².
For context, solar energy here swings from a low near 3.3 kWh/m² to a high of 5.28 kWh/m² in July across the year — September's 4.64 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) | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 |
| 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 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.6 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.7 | Bright |
| 11 | 4.7 | Bright |
| 12 | 4.7 | Bright |
| 13 | 4.7 | Bright |
| 14 | 4.7 | Bright |
| 15 | 4.7 | Bright |
| 16 | 4.7 | Bright |
| 17 | 4.7 | Bright |
| 18 | 4.7 | Bright |
| 19 | 4.7 | Bright |
| 20 | 4.7 | Bright |
| 21 | 4.7 | Bright |
| 22 | 4.6 | Bright |
| 23 | 4.6 | Bright |
| 24 | 4.6 | Bright |
| 25 | 4.6 | Bright |
| 26 | 4.6 | Bright |
| 27 | 4.6 | Bright |
| 28 | 4.5 | Bright |
| 29 | 4.5 | Bright |
| 30 | 4.5 | Bright |
Hazard calendar for Caotun
In September, Caotun sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Caotun sits in the Pacific typhoon belt; the season peaks July–October.
Caotun's monsoon runs June–September, when most of the year's rain falls.
Is September a good time to visit Caotun?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Caotun.
What to pack for Caotun in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Caotun sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.
Sea temperature near Caotun 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 36 km away) is warmest in August at about 29°C and coldest in January near 19°C.
It's comfortable for a long swim from Feb 21 to Jan 4 — about 10.5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 19 | 20 | 22 | 24 | 26 | 28 | 28 | 29 | 28 | 26 | 24 | 21 |
| Comfort | Cool | Cool | Refreshing | Warm | Warm | Warm | Tropical | Tropical | Warm | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 19 | Cool |
| Feb | 20 | Cool |
| Mar | 22 | Refreshing |
| Apr | 24 | Warm |
| May | 26 | Warm |
| Jun | 28 | Warm |
| Jul | 28 | Tropical |
| Aug | 29 | Tropical |
| Sep | 28 | Warm |
| Oct | 26 | Warm |
| Nov | 24 | Warm |
| Dec | 21 | Refreshing |
UV index in Caotun 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 Caotun peaks around June 16 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 | 10 | 9 | 11 | 13 | 11 | 12 | 10 | 8 | 7 | 6 |
| Level | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 8 | Very high |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 11 | Extreme |
| Jun | 13 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 7 | Very high |
| Dec | 6 | High |
Air quality in Caotun 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 Caotun is worst in March — around 56 µg/m³ PM2.5 (unhealthy), about 1.7× the cleanest month (July, 33 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) | 45 | 48 | 56 | 50 | 41 | 34 | 33 | 36 | 41 | 38 | 41 | 39 |
| Level | Poor | Poor | Unhealthy | Poor | Poor | Moderate | Moderate | Poor | Poor | Poor | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 45 | Poor |
| Feb | 48 | Poor |
| Mar | 56 | Unhealthy |
| Apr | 50 | Poor |
| May | 41 | Poor |
| Jun | 34 | Moderate |
| Jul | 33 | Moderate |
| Aug | 36 | Poor |
| Sep | 41 | Poor |
| Oct | 38 | Poor |
| Nov | 41 | Poor |
| Dec | 39 | Poor |
Where is Caotun?
Caotun sits at 24.0°N, 120.7°E, 107 m above sea level, in Taiwan. The nearest listed city is Zhongxing New Village, 2.0 km away.
Topography around Caotun
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Caotun.
Within 3 km, the terrain around Caotun has only modest variations in elevation — a maximum elevation change of 246 m around an average of 127 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,139 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,887 m.
The land around Caotun is covered by trees (34%), artificial surfaces (34%) and cropland (30%) within 3 km, trees (64%) within 16 km, and trees (57%) and water (23%) within 80 km.
Taiwan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 110 / 220 V · 60 Hz
- Happiness
- 6.7 / 10
- World Happiness, 2025
- 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 Caotun (23.977°, 120.6877°, elevation 107 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).