Climate averages 1991–2020
Caotun weather
in September.
A hot, very wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Caotun: daytime highs average 28.2°C and nights cool to about 22.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 230 mm of rain on roughly 21 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.
The nearest other city in this atlas is Nantou, Taiwan (7 km away). In September its highs average 27.1°C, 1.1°C cooler than Caotun, with 230 mm of rain.
Among the 28 cities listed in Taiwan, Caotun ranks 19th of 28 for the warmest September highs and joint 16th of 28 for the driest September (rainfall, lowest first). The mean September high of those 28 cities is 28.5°C; Caotun is 0.3°C cooler than that mean.
From September to October, average highs fall by 1.3°C to 26.9°C, and monthly rainfall falls from 230 mm to 92 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Caotun climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.9°C12.3°C | 12.3°C | 59 | 9.8 | 10.811 h |
| February | 20.8°C13.2°C | 13.2°C | 75 | 10.7 | 11.311 h |
| March | 22.9°C15.4°C | 15.4°C | 99 | 12.4 | 12.012 h |
| April | 25.4°C18.3°C | 18.3°C | 115 | 13.5 | 12.713 h |
| May | 27.4°C20.7°C | 20.7°C | 165 | 17.3 | 13.313 h |
| June | 28.5°C22.0°C | 22.0°C | 215 | 19.7 | 13.614 h |
| July | 29.1°C22.8°C | 22.8°C | 309 | 22.4 | 13.513 h |
| August | 28.5°C22.8°C | 22.8°C | 384 | 25.8 | 13.013 h |
| September, selected | 28.2°C22.2°C | 22.2°C | 230 | 21.3 | 12.312 h |
| October | 26.9°C20.2°C | 20.2°C | 92 | 11.1 | 11.612 h |
| November | 24.9°C17.5°C | 17.5°C | 46 | 7.1 | 11.011 h |
| December | 21.4°C14.1°C | 14.1°C | 56 | 8.3 | 10.711 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Nantou, Taiwan in SeptemberTaiwan · 7 kmHigh 27.1°C · Low 21.2°C · 230 mm rain
- Yuanlin in SeptemberTaiwan · 12 kmHigh 29.1°C · Low 23.2°C · 144 mm rain
- Chang-hua in SeptemberTaiwan · 17 kmHigh 29.1°C · Low 23.6°C · 144 mm rain
- Taichung in SeptemberTaiwan · 19 kmHigh 28.3°C · Low 22.6°C · 255 mm rain
- Puli in SeptemberTaiwan · 29 kmHigh 28.1°C · Low 21.5°C · 298 mm rain
- Douliu in SeptemberTaiwan · 33 kmHigh 28.5°C · Low 22.3°C · 267 mm rain
- Chiayi City in SeptemberTaiwan · 60 kmHigh 28.5°C · Low 22.3°C · 436 mm rain
- Miaoli in SeptemberTaiwan · 67 kmHigh 27.7°C · Low 23.9°C · 182 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Caotun) is explained once on the Caotun year overview and on the Sources, method and limits page.
Nantou, Taiwan lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.