Climate averages 1991–2020
Tainan weather
in September.
A hot, very wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Tainan: daytime highs average 29.4°C and nights cool to about 24.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 183 mm of rain on roughly 14 days, which makes September a very wet month (the 8th 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 Yongkang (6 km away). In September its highs average 29.4°C, about as warm as Tainan, with 183 mm of rain.
Among the 28 cities listed in Taiwan, Tainan ranks joint 1st of 28 for the warmest September highs and joint 8th of 28 for the driest September (rainfall, lowest first). The mean September high of those 28 cities is 28.5°C; Tainan is 1.0°C warmer than that mean.
From September to October, average highs fall by 1.4°C to 28.0°C, and monthly rainfall falls from 183 mm to 54 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
Tainan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.4°C15.5°C | 15.5°C | 49 | 7.2 | 10.911 h |
| February | 22.3°C16.2°C | 16.2°C | 44 | 7.9 | 11.411 h |
| March | 24.6°C18.3°C | 18.3°C | 58 | 9.2 | 12.012 h |
| April | 27.0°C21.3°C | 21.3°C | 120 | 11.8 | 12.713 h |
| May | 28.7°C23.8°C | 23.8°C | 299 | 18.6 | 13.213 h |
| June | 29.7°C25.3°C | 25.3°C | 393 | 19.7 | 13.514 h |
| July | 30.3°C25.7°C | 25.7°C | 305 | 19.1 | 13.413 h |
| August | 29.7°C25.5°C | 25.5°C | 401 | 21.1 | 12.913 h |
| September, selected | 29.4°C24.8°C | 24.8°C | 183 | 13.5 | 12.312 h |
| October | 28.0°C23.0°C | 23.0°C | 54 | 6.4 | 11.612 h |
| November | 25.9°C20.7°C | 20.7°C | 41 | 5.7 | 11.111 h |
| December | 22.7°C17.3°C | 17.3°C | 47 | 6.4 | 10.811 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
- Yongkang in SeptemberTaiwan · 6 kmHigh 29.4°C · Low 23.9°C · 183 mm rain
- Xinying in SeptemberTaiwan · 37 kmHigh 29.4°C · Low 23.6°C · 190 mm rain
- Kaohsiung in SeptemberTaiwan · 43 kmHigh 29.2°C · Low 23.9°C · 189 mm rain
- Chiayi City in SeptemberTaiwan · 60 kmHigh 28.5°C · Low 22.3°C · 436 mm rain
- Douliu in SeptemberTaiwan · 87 kmHigh 28.5°C · Low 22.3°C · 267 mm rain
- Taitung in SeptemberTaiwan · 100 kmHigh 29.0°C · Low 24.8°C · 341 mm rain
- Nantou, Taiwan in SeptemberTaiwan · 113 kmHigh 27.1°C · Low 21.2°C · 230 mm rain
- Yuanlin in SeptemberTaiwan · 114 kmHigh 29.1°C · Low 23.2°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 Tainan) is explained once on the Tainan year overview and on the Sources, method and limits page.
Yongkang lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.