Tainan climate
Tainan (Taiwan) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 25 °C77 °F, and about 1,892 mm74 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Tainan climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2170 | 1864 | 2067 | 391.5 |
| Feb | 2272 | 1865 | 2069 | 311.2 |
| Mar | 2475 | 2068 | 2272 | 481.9 |
| Apr | 2679 | 2373 | 2576 | 793.1 |
| May | 2883 | 2578 | 2780 | 2238.8 |
| Jun | 2984 | 2781 | 2882 | 34414 |
| Jul | 3086 | 2882 | 2984 | 28911 |
| Aug | 2985 | 2882 | 2983 | 44117 |
| Sep | 2984 | 2780 | 2882 | 2429.5 |
| Oct | 2781 | 2576 | 2679 | 722.8 |
| Nov | 2678 | 2373 | 2475 | 491.9 |
| Dec | 2373 | 1967 | 2170 | 341.3 |
| Year | 3086 | 1864 | 2577 | 1,89274 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 57% | 3.5 | 10:52 |
| Feb | 78% | 55% | 4.1 | 11:21 |
| Mar | 77% | 60% | 4.5 | 11:58 |
| Apr | 79% | 62% | 4.9 | 12:40 |
| May | 82% | 66% | 5.3 | 13:14 |
| Jun | 85% | 67% | 5.5 | 13:32 |
| Jul | 83% | 64% | 5.7 | 13:25 |
| Aug | 84% | 70% | 5.0 | 12:55 |
| Sep | 83% | 64% | 4.9 | 12:15 |
| Oct | 80% | 55% | 4.5 | 11:34 |
| Nov | 78% | 56% | 3.8 | 10:00 |
| Dec | 76% | 58% | 3.3 | 10:44 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Tainan is like
The warmest month is July, with an average high of 30 °C86 °F and a low of 28 °C82 °F. The coldest is January, when highs average 21 °C70 °F and lows 18 °C64 °F. There is a clear seasonal cycle, with 9.2 °C16.6 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,892 mm74 in of precipitation per year. The wettest three-month stretch is June–August, which brings 57% of the annual total. The wettest month is August (441 mm17 in), the driest is February (31 mm1.2 in).
Relative humidity ranges from 76% in December to 85% in June. The clearest skies (lowest average cloud amount, 55%) are typical of February. Average wind speed near the ground ranges from 11 km/h (7 mph) in May to 18 km/h (11 mph) in December. Daylight lasts from about 10.7 hours in December to 13.5 hours in June.
Best time to visit Tainan
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October–April. Average highs then reach 21 °C70 °F to 27 °C81 °F. Precipitation is 31 mm1.2 in to 79 mm3.1 in per month.
The most challenging month is August, which is very wet (441 mm17 in) and humid (84% relative humidity).
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
Tainan weather by month
- 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
What to pack for Tainan
- Wetter months (May–September) — highs 2883 to 30 °C86 °F, lows 2578 to 28 °C82 °F, about 308 mm12 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (October–April) — highs 2170 to 27 °C81 °F, lows 1864 to 25 °C76 °F, about 50 mm2.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Tainan compares
The nearest larger place is Kaohsiung, about 43 km to the south. Compared with it, Tainan is on average 1.4 °C2.5 °F cooler. It receives 7% more precipitation (1,892 mm74 in vs 1,764 mm69 in). The difference is largest in February (2.5 °C4.5 °F cooler).
World Climates covers 12 places in Taiwan. By annual mean temperature, Tainan is the 5th warmest of them. By annual precipitation, it is the 6th wettest. See all of them on the Taiwan climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Aberdeen (Hong Kong, Cwa), Zhanjiang (China, Cwa) and Haikou (China, Am).
Nearby places
- Climate in Yongkang 6 km · 25 °C77 °F · 1,892 mm74 in
- Climate in Kaohsiung 43 km · 26 °C79 °F · 1,764 mm69 in
- Climate in Chiayi City 59 km · 25 °C78 °F · 1,902 mm75 in
- Climate in Taitung 99 km · 26 °C78 °F · 1,824 mm72 in
- Climate in Yuanlin 114 km · 25 °C76 °F · 1,738 mm68 in
- Climate in Taichung 137 km · 24 °C76 °F · 1,738 mm68 in
- Climate in Toufen 202 km · 24 °C75 °F · 1,677 mm66 in
- Climate in Hsinchu 216 km · 23 °C73 °F · 1,916 mm75 in
Frequently asked questions
What is the warmest month in Tainan?
July is the warmest month in Tainan. Its average high is 30 °C (86 °F) and its average low is 28 °C (82 °F).
What is the coldest month in Tainan?
January is the coldest month. Its average high is 21 °C (70 °F) and its average low is 18 °C (64 °F).
When does it rain the most in Tainan?
August is the wettest month with about 441 mm (17.4 in) of precipitation. February is the driest with about 31 mm (1.2 in).
What is the best time to visit Tainan?
Judging by long-term averages, the most comfortable months are October–April.
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. The gaps are largest 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.