Tainan climate

Name: Tainan
Address: TW

Tainan is warmest in July, with average highs of 30 °C, and coldest in January, when nights average 15 °C. August is the wettest month (397 mm) and November the driest (40 mm). Figures are 1991–2020 climate normals.

Across a full year Tainan averages 1,955 mm of rain and 256 days above 25 °C.

Taiwan · population 1,856,642 · 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 15 °C
Driest month November 40 mm
Wettest month August 397 mm
Least cloud January 47 % cloud
Hottest on record May 34 °C
Coldest on record January 6.0 °C
Warmest sea July 29 °C

What to expectTainan through the year

Tainan has a clear annual cycle: average daily highs run from 21 °C in January to 30 °C in July, a swing of 9.9 °C in mean temperature across the year.

Counted across a normal year, 256 days a year reach 25 °C, 68 of them reach 30 °C. The warmest reading in the 1991–2020 record is 34 °C, in May.

Rain is strongly seasonal. August averages 397 mm against 40 mm in November — 9.9 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Tainan is warmest in July at 29 °C and coldest in January at 24 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	21.5 °C	46 mm	47 %
February	22.4 °C	42 mm	51 %
March	24.7 °C	58 mm	53 %
April	27.1 °C	116 mm	58 %
May	28.7 °C	281 mm	70 %
June	29.7 °C	383 mm	79 %
July	30.2 °C	308 mm	73 %
August	29.7 °C	397 mm	74 %
September	29.4 °C	188 mm	63 %
October	28.1 °C	54 mm	52 %
November	26.0 °C	40 mm	52 %
December	22.8 °C	43 mm	51 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	21.5 °C	15.3 °C	17.9 °C	27.6 °C	6.0 °C	2	0
February	22.4 °C	16.0 °C	18.8 °C	29.7 °C	8.2 °C	6	0
March	24.7 °C	18.2 °C	21.1 °C	30.7 °C	9.9 °C	15	0
April	27.1 °C	21.3 °C	23.9 °C	31.8 °C	14.1 °C	25	1
May	28.7 °C	23.9 °C	26.1 °C	34.0 °C	19.3 °C	30	7
June	29.7 °C	25.3 °C	27.3 °C	33.8 °C	21.6 °C	30	15
July	30.2 °C	25.7 °C	27.8 °C	34.0 °C	23.3 °C	31	20
August	29.7 °C	25.4 °C	27.4 °C	33.4 °C	23.3 °C	31	14
September	29.4 °C	24.7 °C	26.8 °C	33.2 °C	20.3 °C	30	9
October	28.1 °C	22.8 °C	25.2 °C	32.1 °C	15.3 °C	30	2
November	26.0 °C	20.4 °C	22.8 °C	30.6 °C	12.6 °C	21	0
December	22.8 °C	17.0 °C	19.4 °C	29.6 °C	7.7 °C	5	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	46 mm	7	11 h/day	47 %	78 %	18 km/h	23.5 °C
February	42 mm	7	11 h/day	51 %	79 %	18 km/h	23.5 °C
March	58 mm	9	12 h/day	53 %	79 %	17 km/h	24.1 °C
April	116 mm	11	13 h/day	58 %	81 %	15 km/h	25.8 °C
May	281 mm	18	13 h/day	70 %	84 %	13 km/h	27.6 °C
June	383 mm	20	14 h/day	79 %	85 %	15 km/h	28.8 °C
July	308 mm	20	13 h/day	73 %	85 %	15 km/h	29.4 °C
August	397 mm	21	13 h/day	74 %	86 %	15 km/h	29.3 °C
September	188 mm	14	12 h/day	63 %	84 %	14 km/h	28.8 °C
October	54 mm	7	12 h/day	52 %	81 %	14 km/h	27.6 °C
November	40 mm	5	11 h/day	52 %	80 %	15 km/h	26.0 °C
December	43 mm	6	11 h/day	51 %	78 %	18 km/h	24.5 °C

How Tainan 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
Tainan	30 °C	15 °C	1,955 mm	256
Yongkang · Taiwan	30 °C	14 °C	1,988 mm	264
Kaohsiung · Taiwan	31 °C	15 °C	1,870 mm	279
Fengshan · Taiwan	30 °C	15 °C	1,892 mm	271
Chiayi City · Taiwan	30 °C	12 °C	2,910 mm	240
Chang-hua · Taiwan	30 °C	14 °C	1,751 mm	236
Taichung · Taiwan	29 °C	13 °C	2,260 mm	226

Where Tainan ranks

Ranking	Position	Value
Best beach destinations in Asia in November	24th of 50	94/100
Best beach destinations in Asia in October	32nd of 50	90/100
Best beach destinations in the world in November	38th of 50	94/100

Planning a trip? See the best time to visit Tainan.

QuestionsCommon questions about Tainan’s climate

When is the best time to visit Tainan?

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

How hot does Tainan get?

In July, the warmest month, daily highs average 30 °C. About 68 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average 15 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Tainan?

August, averaging 397 mm over 21 days with rain. The driest month is November with 40 mm. The year as a whole averages 1,955 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 Tainan 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: 22.991°, 120.213° (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.