Chiayi City weather in January

In January, Chiayi City sees average daytime highs of 20°C and overnight lows near 12°C, with 53 mm of rain across 10 wet days and about 10.7 hours of daylight. It is the 12th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 43% of the time in January, and the air most often feels dry.

Daylight stretches from about 10 h 36 min at the start of January to 10 h 54 min by month's end. Set against the rest of the year, January is Chiayi City's 1st-clearest and 2nd-windiest month. For the whole year in context, see Chiayi City's year-round climate.

Daytime high
20°
12th warmest
Overnight low
12°
1st coldest
Rainfall
53 mm
10 wet days
Daylight
10 h 42 min
6:46 AM – 5:28 PM
Cloud cover
47%
1st clearest
Wind
7 km/h
2nd windiest
Solar energy
3.97 kWh/m²
Travel score
6.6
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 20°C through the month.

A typical January day in Chiayi City reaches about 20°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 24°C. Set against its neighbours, January runs about 2°C cooler than December and about 1°C cooler than February.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12113
22113
32113
42113
52113
62113
72113
82113
92113
102113
112113
122112
132112
142012
152012
162012
172012
182012
192012
202012
212012
222012
232012
242012
252012
262012
272012
282012
292012
302012
312012

How January really feels in Chiayi City

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Chiayi City weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 12°531010.76.6
Feb21° / 13°6211.611.26.3
Mar24° / 16°8513.311.86.4
Apr26° / 19°1441612.55.7
May28° / 21°27022.113.14.3
Jun29° / 23°36524.213.43.3
Jul30° / 24°55526.713.33.0
Aug30° / 24°66728.512.82.9
Sep29° / 23°4362412.13.6
Oct27° / 20°20718.611.45.3
Nov25° / 18°811210.96.7
Dec22° / 14°6010.710.66.8

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in January, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of January, with mostly cloudy or overcast conditions the remaining 35%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26634
36634
46634
56733
66733
76733
86733
96733
106733
116634
126634
136634
146535
156535
166535
176535
186337
196337
206337
216337
226337
236238
246337
256337
266337
276238
286337
296337
306337
316436

Chance of precipitation in January

Any precipitation

Chiayi City gets around 53 mm of rain over 10 wet days in January, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
334
434
533
633
732
832
933
1033
1133
1233
1333
1433
1533
1633
1734
1834
1934
2034
2134
2234
2334
2434
2534
2633
2733
2833
2933
3033
3133

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
1444016
2454016
3453915
4453915
5463914
6463914
7473914
8473913
9483913
10483913
11493912
12493812
13513811
14513811
15523810
16523810
1753389
1853389
1953389
2054388
2155378
2255378
2356377
2456377
2556377
2657376
2757376
2857376
2957376
3057376
3156386

Wind in January

Winds average 7 km/h in January.

Across January, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 10 h 36 min at the start of January to 10 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over January. Sunrise moves from 6:44 AM to 6:44 AM, and sunset from 5:19 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.66:445:19
210.66:445:19
310.66:455:20
410.66:455:21
510.66:455:21
610.66:455:22
710.66:465:22
810.66:465:23
910.66:465:24
1010.66:465:24
1110.66:465:25
1210.76:465:26
1310.76:465:26
1410.76:465:27
1510.76:465:28
1610.76:465:28
1710.76:465:29
1810.76:465:30
1910.76:465:31
2010.76:465:31
2110.86:465:32
2210.86:465:33
2310.86:465:33
2410.86:465:34
2510.86:465:35
2610.86:455:35
2710.86:455:36
2810.96:455:37
2910.96:455:38
3010.96:445:38
3110.96:445:39

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 3.97 kWh/m².

For context, solar energy here swings from a low near 3.6 kWh/m² to a high of 5.62 kWh/m² in April across the year — January's 3.97 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
13.7Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
194.0Moderate
204.0Moderate
214.0Moderate
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.2Bright
314.2Bright
Planning a trip in January

Hazard calendar for Chiayi City

In seasonPeak

In January, Chiayi City sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Chiayi City sits in the Pacific typhoon belt; the season peaks July–October.

Chiayi City's monsoon runs June–September, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Chiayi City?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.6
Sightseeing
3rd-best month of the year
3.7
Beach & pool
12th-best month of the year

January is a reasonable time to visit Chiayi City for sightseeing.

What to pack for Chiayi City in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Chiayi City sees daytime highs around 20°C and nights near 12°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Chiayi City in January

The nearest coast averages about 22°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 km away) is warmest in July at about 29°C and coldest in January near 22°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar23Refreshing
Apr25Warm
May27Warm
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep28Tropical
Oct27Warm
Nov25Warm
Dec23Refreshing

UV index in Chiayi City in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chiayi City peaks around June 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJun 17UV 12Dec 20UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr8Very high
May10Very high
Jun12Extreme
Jul10Extreme
Aug11Extreme
Sep9Very high
Oct7Very high
Nov7High
Dec6High

Air quality in Chiayi City in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Chiayi City is worst in March — around 40 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (July, 23 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMar 1739 µg/m³Jul 1323 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb36Poor
Mar40Poor
Apr36Poor
May28Moderate
Jun24Moderate
Jul23Moderate
Aug25Moderate
Sep31Moderate
Oct33Moderate
Nov34Moderate
Dec33Moderate
Location & terrain

Where is Chiayi City?

Chiayi City sits at 23.5°N, 120.4°E, 45 m above sea level, in Taiwan. The nearest listed city is Taibao, 12 km away.

XinyingDouliuCitongBudaiErlun

Topography around Chiayi City

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiayi City.

Within 3 km, the terrain around Chiayi City has only modest variations in elevation — a maximum elevation change of 84 m around an average of 40 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 860 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,887 m.

The land around Chiayi City is covered by artificial surfaces (65%) and trees (23%) within 3 km, trees (46%) and cropland (37%) within 16 km, and trees (47%) and water (32%) within 80 km.

3 km
84 m
16 km
860 m
80 km
3,887 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Taibao 12 km · Xingang 14 km · Beigang 18 km · Xinying 24 km · Douliu 27 km · Citong 31 km · Budai 31 km · Erlun 33 km

Taiwan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
110 / 220 V · 60 Hz
Happiness
6.7 / 10
World Happiness, 2025
Religion
Buddhist 35%Taoist 33%none or unspecified 18%folk religion approximately 10%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chiayi City (23.4792°, 120.4489°, elevation 45 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).