Chiayi City climate

Name: Chiayi City
Address: TW

Chiayi City is warmest in July, with average highs of 30 °C, and coldest in January, when nights average 12 °C. August is the wettest month (652 mm) and January the driest (52 mm). Figures are 1991–2020 climate normals.

Across a full year Chiayi City averages 2,910 mm of rain and 240 days above 25 °C.

Taiwan · population 263,188 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 30 °C
Coldest month January 12 °C
Driest month January 52 mm
Wettest month August 652 mm
Least cloud January 47 % cloud
Hottest on record May 37 °C
Coldest on record January 3.1 °C

What to expectChiayi City through the year

Chiayi City has a clear annual cycle: average daily highs run from 21 °C in January to 30 °C in July, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 240 days a year reach 25 °C, 47 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in May.

Rain is strongly seasonal. August averages 652 mm against 52 mm in January — 13 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	20.6 °C	52 mm	47 %
February	21.7 °C	60 mm	53 %
March	24.1 °C	85 mm	54 %
April	26.6 °C	145 mm	60 %
May	28.3 °C	276 mm	71 %
June	29.3 °C	366 mm	81 %
July	29.7 °C	535 mm	77 %
August	29.2 °C	652 mm	77 %
September	28.7 °C	415 mm	68 %
October	27.4 °C	192 mm	56 %
November	25.4 °C	76 mm	51 %
December	21.9 °C	56 mm	49 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	20.6 °C	12.2 °C	15.9 °C	29.1 °C	3.1 °C	2	0
February	21.7 °C	13.3 °C	17.0 °C	31.6 °C	4.8 °C	5	0
March	24.1 °C	15.8 °C	19.5 °C	34.4 °C	5.3 °C	12	1
April	26.6 °C	18.9 °C	22.5 °C	35.8 °C	8.5 °C	22	2
May	28.3 °C	21.5 °C	24.8 °C	36.8 °C	15.8 °C	29	5
June	29.3 °C	23.2 °C	26.1 °C	35.4 °C	17.9 °C	30	10
July	29.7 °C	23.6 °C	26.6 °C	35.1 °C	19.8 °C	31	13
August	29.2 °C	23.5 °C	26.2 °C	33.8 °C	20.3 °C	31	8
September	28.7 °C	22.6 °C	25.5 °C	34.1 °C	15.0 °C	29	4
October	27.4 °C	20.4 °C	23.7 °C	36.2 °C	13.0 °C	28	2
November	25.4 °C	17.7 °C	21.2 °C	33.9 °C	8.8 °C	17	2
December	21.9 °C	13.9 °C	17.4 °C	30.9 °C	5.1 °C	4	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	52 mm	9	11 h/day	47 %	80 %	12 km/h
February	60 mm	11	11 h/day	53 %	80 %	12 km/h
March	85 mm	13	12 h/day	54 %	81 %	12 km/h
April	145 mm	15	13 h/day	60 %	82 %	11 km/h
May	276 mm	22	13 h/day	71 %	84 %	10 km/h
June	366 mm	24	14 h/day	81 %	84 %	12 km/h
July	535 mm	26	13 h/day	77 %	84 %	11 km/h
August	652 mm	28	13 h/day	77 %	86 %	11 km/h
September	415 mm	23	12 h/day	68 %	85 %	10 km/h
October	192 mm	17	12 h/day	56 %	81 %	10 km/h
November	76 mm	11	11 h/day	51 %	81 %	11 km/h
December	56 mm	9	11 h/day	49 %	80 %	12 km/h

How Chiayi City compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Chiayi City	30 °C	12 °C	2,910 mm	240
Yongkang · Taiwan	30 °C	14 °C	1,988 mm	264
Tainan · Taiwan	30 °C	15 °C	1,955 mm	256
Chang-hua · Taiwan	30 °C	14 °C	1,751 mm	236
Taichung · Taiwan	29 °C	13 °C	2,260 mm	226
Fengshan · Taiwan	30 °C	15 °C	1,892 mm	271
Kaohsiung · Taiwan	31 °C	15 °C	1,870 mm	279

Planning a trip? See the best time to visit Chiayi City.

QuestionsCommon questions about Chiayi City’s climate

When is the best time to visit Chiayi City?

That depends on what you want, so the honest answer is a comparison rather than a single month. March, April, November sit closest to 20 °C on average, July is the warmest month and January the driest. The month-by-month table above has the full picture.

How hot does Chiayi City get?

In July, the warmest month, daily highs average 30 °C. About 47 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 12 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Chiayi City?

August, averaging 652 mm over 28 days with rain. The driest month is January with 52 mm. The year as a whole averages 2,910 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Chiayi City rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 23.479°, 120.449° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.