Tainan weather in January
In January, Tainan has an average high of 21 °C70 °F and an average low of 18 °C64 °F, with about 39 mm1.5 in of precipitation. January is the coldest month of the year and ranks 10th for precipitation.
How January compares with other months
Compared with December, January is 1.5 °C2.8 °F cooler on average and wetter by 6 mm0.2 in. Compared with February, January is 0.8 °C1.4 °F cooler on average and wetter by 9 mm0.3 in. Daylight lasts about 10.9 hours around the middle of the month. Average relative humidity is 77% and the average cloud amount 57%.
Is January a good time to visit Tainan?
Yes — January is one of the most comfortable months to visit Tainan by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in January
For Tainan in January, pack light layers — T-shirts plus a light sweater or jacket.
January in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Tainan | 2170 | 1864 | 391.5 |
| Yongkang | 2170 | 1864 | 391.5 |
| Kaohsiung | 2576 | 1966 | 331.3 |
| Chiayi City | 2577 | 1458 | 471.9 |
| Taitung | 2373 | 1966 | 512.0 |
| Yuanlin | 2373 | 1457 | 491.9 |
| Taichung | 2373 | 1457 | 491.9 |
| Toufen | 2068 | 1660 | 652.6 |
| Hsinchu | 1865 | 1356 | 953.7 |
Nearby places that are more than 1 °C1.8 °F warmer in January: Kaohsiung and Taitung; cooler: Yuanlin, Taichung, Toufen and Hsinchu.
Other months in Tainan
- January21 °C70 °F / 18 °C64 °F
- February22 °C72 °F / 18 °C65 °F
- March24 °C75 °F / 20 °C68 °F
- April26 °C79 °F / 23 °C73 °F
- May28 °C83 °F / 25 °C78 °F
- June29 °C84 °F / 27 °C81 °F
- July30 °C86 °F / 28 °C82 °F
- August29 °C85 °F / 28 °C82 °F
- September29 °C84 °F / 27 °C80 °F
- October27 °C81 °F / 25 °C76 °F
- November26 °C78 °F / 23 °C73 °F
- December23 °C73 °F / 19 °C67 °F
Frequently asked questions
How warm is Tainan in January?
In January the average high in Tainan is 21 °C (70 °F) and the average low is 18 °C (64 °F).
Does it rain a lot in Tainan in January?
On average about 39 mm (1.5 in) of precipitation falls in January; it ranks 10th of the 12 months.
Is January the warmest month in Tainan?
No. The warmest month in Tainan is July, with an average high of 30 °C (86 °F). The coldest month is January, with an average low of 18 °C (64 °F).
How long is the day in Tainan in January?
In the middle of January the day in Tainan lasts about 10.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Tainan in January?
The average relative humidity in January is about 77%. This is a long-term average for the whole day.
How cloudy is Tainan in January?
On average about 57% of the sky is covered by cloud in January. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.