Climate averages 1991–2020
Chiayi City 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 Chiayi City: daytime highs average 28.5°C and nights cool to about 22.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 436 mm of rain on roughly 24 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 Xinying (24 km away). In September its highs average 29.4°C, 0.9°C warmer than Chiayi City, with 190 mm of rain.
Among the 28 cities listed in Taiwan, Chiayi City ranks joint 11th of 28 for the warmest September highs and 27th of 28 for the driest September (rainfall, lowest first). The mean September high of those 28 cities is 28.5°C; Chiayi City is level with that mean.
From September to October, average highs fall by 1.5°C to 27.0°C, and monthly rainfall falls from 436 mm to 207 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
Chiayi City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.2°C11.9°C | 11.9°C | 53 | 10.1 | 10.911 h |
| February | 21.3°C12.9°C | 12.9°C | 62 | 11.6 | 11.411 h |
| March | 23.7°C15.3°C | 15.3°C | 85 | 13.3 | 12.012 h |
| April | 26.1°C18.4°C | 18.4°C | 144 | 16.0 | 12.713 h |
| May | 28.0°C21.1°C | 21.1°C | 270 | 22.1 | 13.313 h |
| June | 29.0°C22.8°C | 22.8°C | 365 | 24.2 | 13.614 h |
| July | 29.5°C23.4°C | 23.4°C | 555 | 26.7 | 13.413 h |
| August | 29.0°C23.3°C | 23.3°C | 667 | 28.4 | 12.913 h |
| September, selected | 28.5°C22.3°C | 22.3°C | 436 | 23.9 | 12.312 h |
| October | 27.0°C20.2°C | 20.2°C | 207 | 18.6 | 11.612 h |
| November | 25.0°C17.4°C | 17.4°C | 81 | 12.0 | 11.011 h |
| December | 21.5°C13.7°C | 13.7°C | 60 | 10.7 | 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
- Xinying in SeptemberTaiwan · 24 kmHigh 29.4°C · Low 23.6°C · 190 mm rain
- Douliu in SeptemberTaiwan · 27 kmHigh 28.5°C · Low 22.3°C · 267 mm rain
- Nantou, Taiwan in SeptemberTaiwan · 53 kmHigh 27.1°C · Low 21.2°C · 230 mm rain
- Yongkang in SeptemberTaiwan · 54 kmHigh 29.4°C · Low 23.9°C · 183 mm rain
- Yuanlin in SeptemberTaiwan · 55 kmHigh 29.1°C · Low 23.2°C · 144 mm rain
- Tainan in SeptemberTaiwan · 60 kmHigh 29.4°C · Low 24.8°C · 183 mm rain
- Caotun in SeptemberTaiwan · 60 kmHigh 28.2°C · Low 22.2°C · 230 mm rain
- Chang-hua in SeptemberTaiwan · 67 kmHigh 29.1°C · Low 23.6°C · 144 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 Chiayi City) is explained once on the Chiayi City year overview and on the Sources, method and limits page.