Chiayi City climate
Chiayi City (Taiwan) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 25 °C78 °F, and about 1,902 mm75 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Chiayi City climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2577 | 1458 | 2068 | 471.9 |
| Feb | 2780 | 1660 | 2170 | 391.5 |
| Mar | 2983 | 1864 | 2374 | 662.6 |
| Apr | 3188 | 2169 | 2679 | 1024.0 |
| May | 3290 | 2475 | 2882 | 2529.9 |
| Jun | 3289 | 2577 | 2883 | 34313 |
| Jul | 3391 | 2578 | 2984 | 26811 |
| Aug | 3290 | 2678 | 2984 | 40016 |
| Sep | 3289 | 2576 | 2883 | 2289.0 |
| Oct | 3188 | 2272 | 2780 | 732.9 |
| Nov | 2985 | 2068 | 2576 | 471.9 |
| Dec | 2679 | 1661 | 2170 | 371.4 |
| Year | 3391 | 1458 | 2578 | 1,90275 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 73% | 56% | 3.4 | 10:50 |
| Feb | 72% | 61% | 3.8 | 11:20 |
| Mar | 71% | 66% | 4.1 | 11:57 |
| Apr | 72% | 70% | 4.5 | 12:40 |
| May | 78% | 72% | 4.9 | 13:16 |
| Jun | 85% | 73% | 5.1 | 13:34 |
| Jul | 85% | 67% | 5.5 | 13:27 |
| Aug | 87% | 70% | 4.9 | 12:56 |
| Sep | 85% | 61% | 4.9 | 12:15 |
| Oct | 79% | 47% | 4.5 | 11:34 |
| Nov | 75% | 53% | 3.6 | 10:58 |
| Dec | 73% | 52% | 3.2 | 10:42 |
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 Chiayi City is like
The warmest month is July, with an average high of 33 °C91 °F and a low of 25 °C78 °F. The coldest is January, when highs average 25 °C77 °F and lows 14 °C58 °F. There is a clear seasonal cycle, with 9.3 °C16.7 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,902 mm75 in of precipitation per year. The wettest three-month stretch is June–August, which brings 53% of the annual total. The wettest month is August (400 mm16 in), the driest is December (37 mm1.4 in).
Relative humidity ranges from 71% in March to 87% in August. The clearest skies (lowest average cloud amount, 47%) are typical of October. Average wind speed near the ground ranges from 5 km/h (3 mph) in November to 7 km/h (4 mph) in June. Daylight lasts from about 10.7 hours in December to 13.6 hours in June.
Best time to visit Chiayi City
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–March: average highs of 25 °C77 °F to 29 °C85 °F with 37 mm1.4 in to 66 mm2.6 in of precipitation per month.
The most challenging month is August, which is hot, with average highs of 32 °C90 °F, very wet (400 mm16 in) and humid (87% relative humidity).
Comfort score: months are ranked by how close they come to 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.
What to pack for Chiayi City
- Wetter months (May–September) — highs 3289 to 33 °C91 °F, lows 2475 to 26 °C78 °F, about 298 mm12 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (October–April) — highs 2577 to 31 °C88 °F, lows 1458 to 22 °C72 °F, about 59 mm2.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Chiayi City compares
Compared with Tainan, about 59 km to the southwest, Chiayi City is on average 0.6 °C1 °F warmer and receives a similar amount of precipitation. The difference is largest in April (1.4 °C2.4 °F warmer).
Of the 12 places in Taiwan covered by World Climates, Chiayi City is the 3rd warmest by annual mean temperature and the 5th wettest by annual precipitation. See all of them on the Taiwan climate page.
Places in other countries with the most similar temperature and rainfall pattern: Miami (United States, Aw), Fort Lauderdale (United States, Aw) and West Palm Beach (United States, Am).
The same NASA POWER grid cell also contains Douliu (pop. 107,924). Their long-term averages in this dataset are essentially the same as for Chiayi City, so they do not have separate pages.
Nearby places
- Yongkang 54 km · 25 °C77 °F · 1,892 mm74 in
- Yuanlin 55 km · 25 °C76 °F · 1,738 mm68 in
- Tainan 59 km · 25 °C77 °F · 1,892 mm74 in
- Taichung 78 km · 24 °C76 °F · 1,738 mm68 in
- Kaohsiung 97 km · 26 °C79 °F · 1,764 mm69 in
- Taitung 107 km · 26 °C78 °F · 1,824 mm72 in
- Toufen 142 km · 24 °C75 °F · 1,677 mm66 in
- Hsinchu 156 km · 23 °C73 °F · 1,916 mm75 in
Frequently asked questions
What is the warmest month in Chiayi City?
July is the warmest month in Chiayi City, with an average high of 33 °C (91 °F) and an average low of 25 °C (78 °F).
What is the coldest month in Chiayi City?
January is the coldest month, with an average high of 25 °C (77 °F) and an average low of 14 °C (58 °F).
When does it rain the most in Chiayi City?
August is the wettest month with about 400 mm (15.8 in) of precipitation; December is the driest with about 37 mm (1.4 in).
What is the best time to visit Chiayi City?
Judging by long-term averages, the most comfortable months are November–March.
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.
The grid cell’s average elevation is 687 m, while Chiayi City lies at about 45 m. Temperatures on this page were therefore adjusted by +4.2 °C7.5 °F using the standard lapse rate of 6.5 °C per 1,000 m.