Yilan weather in January

In January, Yilan sees average daytime highs of 17°C and overnight lows near 13°C, with 190 mm of precipitation across 22 wet days and about 10.6 hours of daylight. It is the 12th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 7% of the time in January, and the air most often feels dry.

Daylight stretches from about 10 h 30 min at the start of January to 10 h 48 min by month's end. Set against the rest of the year, January is Yilan's 10th-clearest and 3rd-windiest month. For the whole year in context, see Yilan's year-round climate.

Daytime high
17°
12th warmest
Overnight low
13°
1st coldest
Precipitation
190 mm
22 wet days
Daylight
10 h 36 min
6:44 AM – 5:21 PM
Cloud cover
82%
10th clearest
Wind
9 km/h
3rd windiest
Solar energy
2.24 kWh/m²
Travel score
3.6
out of 10

Yilan is A county-administered city in Yilan County, Taiwan.

Density
3,203/km²
people per km²
Founded
1945

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical January day in Yilan reaches about 17°C in the afternoon and slips back to 13°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 21°C. Set against its neighbours, January runs about 2°C cooler than December and on par with February.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11713
21713
31713
41713
51713
61713
71713
81713
91713
101713
111713
121713
131713
141713
151713
161713
171613
181613
191613
201612
211612
221612
231612
241612
251612
261612
271612
281612
291612
301612
311612

How January really feels in Yilan

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.

Yilan weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 13°1902210.63.6
Feb17° / 13°16419.711.13.9
Mar19° / 15°15219.911.84.6
Apr22° / 18°18520.812.64.8
May25° / 21°29725.213.24.3
Jun28° / 24°31925.313.53.6
Jul30° / 25°27122.313.43.7
Aug29° / 25°32922.912.93.7
Sep27° / 24°33620.512.24.6
Oct24° / 21°39421.611.44.9
Nov21° / 18°3362110.84.6
Dec18° / 14°24421.710.54.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 9% of January, with mostly cloudy or overcast conditions the remaining 84%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11783
21783
31684
41684
51684
61585
71684
81684
91684
101684
111684
121684
131585
141585
151585
161585
171585
181585
191585
201684
211783
221882
231882
241783
251783
261783
271783
281783
291783
301783
311882

Chance of precipitation in January

Any precipitation

Yilan gets around 190 mm of rain and snow over 22 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 71% and peaks near 73% on the wettest days, and about 0 day brings snow.

0%20%40%60%80%151015202531
Rain chance (%)
169
269
369
470
570
670
771
871
971
1071
1172
1272
1372
1472
1572
1672
1773
1873
1973
2073
2173
2273
2372
2472
2572
2672
2772
2871
2971
3071
3171

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 58% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15133160
25133160
35133160
45133160
55133160
65233150
75332150
85332150
95332150
105431150
115531140
125530141
135530141
145630131
155829121
165829121
175929111
186029101
196029101
20612991
21622981
22632980
23642970
24642970
25643060
26643060
27643060
28643060
29643060
30633160
31633160

Wind in January

Winds average 9 km/h in January.

Across January, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 10 h 30 min at the start of January to 10 h 48 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 6:42 AM to 6:41 AM, and sunset from 5:11 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.56:425:11
210.56:425:11
310.56:425:12
410.56:425:13
510.56:435:13
610.56:435:14
710.56:435:15
810.56:435:15
910.56:435:16
1010.66:435:17
1110.66:445:17
1210.66:445:18
1310.66:445:19
1410.66:445:19
1510.66:445:20
1610.66:445:21
1710.66:445:22
1810.66:445:22
1910.76:445:23
2010.76:435:24
2110.76:435:24
2210.76:435:25
2310.76:435:26
2410.76:435:27
2510.76:435:27
2610.86:425:28
2710.86:425:29
2810.86:425:29
2910.86:425:30
3010.86:415:31
3110.86:415:32

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.24 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 5.81 kWh/m² in July across the year — January's 2.24 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.2Moderate
22.2Moderate
32.2Moderate
42.2Moderate
52.2Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.2Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.2Moderate
192.2Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.3Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.3Moderate
302.3Moderate
312.4Moderate
Planning a trip in January

Hazard calendar for Yilan

In seasonPeak

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

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

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

Is January a good time to visit Yilan?

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

3.6
Sightseeing
11th-best month of the year
0.7
Beach & pool
12th-best month of the year

January is a weaker month for outdoor sightseeing in Yilan.

What to pack for Yilan in January

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

In January, Yilan sees daytime highs around 17°C and nights near 13°C. Pack rain gear. Worth having: a warm layer. About 22 days see rain.

rain geara warm layer

Sea temperature near Yilan 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 18 km away) is warmest in August at about 28°C and coldest in January near 22°C.

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

20°22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar23Refreshing
Apr24Warm
May26Warm
Jun27Warm
Jul28Tropical
Aug28Tropical
Sep28Warm
Oct26Warm
Nov25Warm
Dec23Refreshing

UV index in Yilan 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 Yilan peaks around July 14 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 14UV 11Dec 21UV 5
UV index (midday)Level
Jan6High
Feb8Very high
Mar9Very high
Apr7High
May10Extreme
Jun11Extreme
Jul12Extreme
Aug10Very high
Sep11Extreme
Oct8Very high
Nov7High
Dec5Moderate

Air quality in Yilan 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 Yilan is worst in April — around 52 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (October, 25 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateApr 1052 µg/m³Oct 1626 µg/m³
PM2.5 (µg/m³)Level
Jan38Poor
Feb43Poor
Mar51Poor
Apr52Poor
May44Poor
Jun41Poor
Jul32Moderate
Aug32Moderate
Sep30Moderate
Oct25Moderate
Nov32Moderate
Dec32Moderate
Location & terrain

Where is Yilan?

Yilan sits at 24.8°N, 121.8°E, 15 m above sea level, in Taiwan. The nearest listed city is Xizhi, 36 km away.

XizhiNeihuTaipeiJiufenBanqiaoKeelungShulinSanxia

Topography around Yilan

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

Within 3 km, the terrain around Yilan has only modest variations in elevation — a maximum elevation change of 33 m around an average of 9 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,413 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,839 m.

The land around Yilan is covered by cropland (40%), artificial surfaces (35%) and trees (21%) within 3 km, trees (50%) and water (23%) within 16 km, and trees (47%) and water (46%) within 80 km.

3 km
33 m
16 km
1,413 m
80 km
3,839 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Xizhi 36 km · Neihu 40 km · Taipei 40 km · Jiufen 40 km · Banqiao 41 km · Keelung 42 km · Shulin 42 km · Sanxia 43 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 Yilan (24.757°, 121.753°, elevation 15 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).