Yilan weather in April

In April, Yilan sees average daytime highs of 22°C and overnight lows near 18°C, with 185 mm of rain across 20.8 wet days and about 12.6 hours of daylight. It is the 7th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 24°C by the end. The sky is clear or mostly clear about 7% of the time in April, and the air most often feels muggy.

Daylight stretches from about 12 h 12 min at the start of April to 12 h 54 min by month's end. Set against the rest of the year, April is Yilan's 5th-clearest and 8th-windiest month. For the whole year in context, see Yilan's year-round climate.

Daytime high
22°
7th warmest
Overnight low
18°
6th coldest
Rainfall
185 mm
20.8 wet days
Daylight
12 h 36 min
5:36 AM – 6:11 PM
Cloud cover
77%
5th clearest
Wind
7 km/h
8th windiest
Solar energy
4.39 kWh/m²
Travel score
4.8
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 April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 21°C in the first days to 24°C by the end.

A typical April day in Yilan reaches about 22°C in the afternoon and slips back to 18°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 26°C. Set against its neighbours, April runs about 3°C warmer than March and about 3°C cooler than May.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12116
22116
32116
42117
52117
62117
72117
82117
92217
102217
112217
122217
132218
142218
152218
162218
172318
182318
192318
202318
212319
222319
232319
242319
252319
262419
272419
282419
292419
302420

How April really feels in Yilan

Once humidity and wind are folded in, April 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

April 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 April compares with the rest of the year at a glance. April is the 7th-warmest and 10th-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 April

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 15% of April, with mostly cloudy or overcast conditions the remaining 77%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12476
22476
32476
42476
52476
62476
72476
82476
92476
102476
112476
122476
132377
142476
152377
162377
172377
182278
192278
202278
212278
222278
232179
242080
252080
262080
272080
281981
291981
301981

Chance of precipitation in April

Any precipitation

Yilan gets around 185 mm of rain over 20.8 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 70% and peaks near 76% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
165
265
366
466
567
667
767
868
968
1068
1168
1268
1368
1469
1569
1669
1769
1869
1970
2070
2170
2271
2372
2472
2573
2674
2775
2875
2975
3076

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the muggy band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 43% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1222534190
2212534200
3202534210
4192534220
5182533230
6172533250
7162533260
8152532271
9142432291
10132431311
11122331331
12122231351
13112130361
14102029382
15101929402
1691828423
1791827433
1881727444
1981626464
2071526475
2171525486
2271425487
2361324498
2461223509
25611235010
26611225012
27510224914
28510224815
29510214717
3059214619

Wind in April

Winds average 7 km/h in April.

Across April, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
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
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over April. Sunrise moves from 5:51 AM to 5:24 AM, and sunset from 6:04 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:516:04
212.25:506:05
312.35:496:05
412.35:486:05
512.35:476:06
612.35:466:06
712.45:456:07
812.45:446:07
912.45:436:08
1012.45:426:08
1112.55:416:08
1212.55:406:09
1312.55:396:09
1412.55:386:10
1512.65:376:10
1612.65:366:11
1712.65:356:11
1812.65:346:11
1912.65:336:12
2012.75:326:12
2112.75:316:13
2212.75:306:13
2312.75:296:14
2412.85:296:14
2512.85:286:15
2612.85:276:15
2712.85:266:16
2812.85:256:16
2912.95:246:17
3012.95:246:17

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.39 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 — April's 4.39 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.2Bright
74.2Bright
84.2Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.4Bright
144.4Bright
154.4Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in April

Hazard calendar for Yilan

In seasonPeak

In April, 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 April a good time to visit Yilan?

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

4.8
Sightseeing
2nd-best month of the year
3.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Yilan for sightseeing.

What to pack for Yilan in April

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

In April, Yilan sees daytime highs around 22°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 21 days see rain.

rain gearlight clothes

Sea temperature near Yilan in April

The nearest coast averages about 24°C in April — 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 April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — 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 April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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
April 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).