Climate averages 1991–2020
Yilan, Taiwan weather
in September.
A warm, very wet month: the 4th warmest and the joint 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Yilan, Taiwan: daytime highs average 27.8°C and nights cool to about 23.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 336 mm of rain on roughly 21 days, which makes September a very wet month (the joint 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 19 min on an average September day.
The nearest other city in this atlas is Neihu (40 km away). In September its highs average 28.5°C, 0.7°C warmer than Yilan, Taiwan, with 258 mm of rain.
Among the 28 cities listed in Taiwan, Yilan, Taiwan ranks 25th of 28 for the warmest September highs and 25th of 28 for the driest September (rainfall, lowest first). The mean September high of those 28 cities is 28.5°C; Yilan, Taiwan is 0.6°C cooler than that mean.
From September to October, average highs fall by 3.1°C to 24.7°C, and monthly rainfall rises from 336 mm to 394 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
Yilan, Taiwan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.5°C13.4°C | 13.4°C | 190 | 22.0 | 10.811 h |
| February | 18.3°C13.6°C | 13.6°C | 165 | 19.9 | 11.311 h |
| March | 20.6°C15.1°C | 15.1°C | 151 | 19.9 | 12.012 h |
| April | 23.6°C18.0°C | 18.0°C | 185 | 20.7 | 12.713 h |
| May | 26.4°C21.4°C | 21.4°C | 297 | 25.2 | 13.313 h |
| June | 28.8°C24.2°C | 24.2°C | 319 | 25.3 | 13.614 h |
| July | 30.1°C25.5°C | 25.5°C | 271 | 22.3 | 13.514 h |
| August | 29.7°C25.4°C | 25.4°C | 329 | 22.9 | 13.013 h |
| September, selected | 27.8°C23.7°C | 23.7°C | 336 | 20.5 | 12.312 h |
| October | 24.7°C21.1°C | 21.1°C | 394 | 21.6 | 11.612 h |
| November | 22.1°C18.5°C | 18.5°C | 336 | 21.0 | 11.011 h |
| December | 18.8°C15.1°C | 15.1°C | 243 | 21.7 | 10.611 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
- Neihu in SeptemberTaiwan · 40 kmHigh 28.5°C · Low 24.8°C · 258 mm rain
- Taipei in SeptemberTaiwan · 40 kmHigh 28.6°C · Low 24.5°C · 258 mm rain
- Banqiao in SeptemberTaiwan · 41 kmHigh 28.5°C · Low 23.5°C · 258 mm rain
- Keelung in SeptemberTaiwan · 42 kmHigh 28.3°C · Low 25.2°C · 192 mm rain
- Shulin in SeptemberTaiwan · 42 kmHigh 28.4°C · Low 23.5°C · 258 mm rain
- Sanxia in SeptemberTaiwan · 43 kmHigh 29.2°C · Low 23.6°C · 180 mm rain
- Bade in SeptemberTaiwan · 51 kmHigh 28.3°C · Low 22.9°C · 180 mm rain
- Taoyuan in SeptemberTaiwan · 53 kmHigh 27.9°C · Low 23.4°C · 180 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 Yilan) is explained once on the Yilan, Taiwan year overview and on the Sources, method and limits page.