Click on a day for an hourly weather forecast
The weather in Tainan in September is very hot. The average temperatures are between 26°C and 31°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Tainan. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Tainan in September 2025.
If you’re planning to visit Tainan in the near future, we highly recommend that you review the 14 day weather forecast for Tainan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 22° / 16° | 3 | 28 | 0 | 16 mm | Good | Tainan in January |
| February | 23° / 17° | 3 | 25 | 0 | 14 mm | Perfect | Tainan in February |
| March | 25° / 20° | 4 | 27 | 0 | 20 mm | Perfect | Tainan in March |
| April | 27° / 22° | 7 | 23 | 0 | 41 mm | Perfect | Tainan in April |
| May | 29° / 25° | 14 | 17 | 0 | 111 mm | Ok | Tainan in May |
| June | 31° / 26° | 15 | 15 | 0 | 154 mm | Ok | Tainan in June |
| July | 31° / 27° | 14 | 17 | 0 | 106 mm | Ok | Tainan in July |
| August | 31° / 27° | 16 | 15 | 0 | 203 mm | Ok | Tainan in August |
| September | 31° / 26° | 9 | 21 | 0 | 80 mm | Ok | Tainan in September |
| October | 29° / 25° | 5 | 26 | 0 | 24 mm | Good | Tainan in October |
| November | 27° / 22° | 4 | 26 | 0 | 18 mm | Perfect | Tainan in November |
| December | 23° / 18° | 3 | 28 | 0 | 18 mm | Perfect | Tainan in December |