Tainan is warmest in July, averaging 31° by day and 28° at night. The wettest month is August with 322 mm, and the year brings about 1389 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 22° | 18° | 28 mm | 23° | 10.7 h | Sightseeing |
| February | 23° | 19° | 34 mm | 23° | 11.2 h | Sightseeing |
| March | 25° | 20° | 37 mm | 25° | 11.8 h | Beach weather |
| April | 27° | 23° | 63 mm | 26° | 12.5 h | Beach weather |
| May | 29° | 26° | 186 mm | 28° | 13.1 h | Rainy season |
| June | 30° | 28° | 201 mm | 30° | 13.4 h | Rainy season |
| July | 31° | 28° | 205 mm | 30° | 13.3 h | Rainy season |
| August | 30° | 28° | 322 mm | 30° | 12.8 h | Rainy season |
| September | 30° | 27° | 135 mm | 29° | 12.1 h | Mild |
| October | 29° | 25° | 105 mm | 28° | 11.5 h | Beach weather |
| November | 27° | 23° | 51 mm | 26° | 10.9 h | Beach weather |
| December | 24° | 20° | 22 mm | 25° | 10.6 h | Sightseeing |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: March, April, October and November — highs around 27°, nights no colder than 20°, and at most 105 mm of rain in a month. The sea sits at 25–28° then.
Walking the city: January, February and December — highs of 22–24° and no more than 34 mm of rain a month.
Wet season: May, June, July and August — up to 322 mm in a single month.