Ijūin weather in April

In April, Ijūin sees average daytime highs of 21°C and overnight lows near 13°C, with 176 mm of rain across 11.6 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 22°C by the end. The sky is clear or mostly clear about 29% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 18 min at the start of April to 13 h 12 min by month's end. Set against the rest of the year, April is Ijūin's 9th-clearest and 5th-windiest month. For the whole year in context, see Ijūin's year-round climate.

Daytime high
21°
7th warmest
Overnight low
13°
6th coldest
Rainfall
176 mm
11.6 wet days
Daylight
12 h 48 min
5:55 AM – 6:42 PM
Cloud cover
64%
9th clearest
Wind
11 km/h
5th windiest
Solar energy
4.89 kWh/m²
Travel score
6.0
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 19°C in the first days to 22°C by the end.

A typical April day in Ijūin reaches about 21°C in the afternoon and slips back to 13°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, April runs about 4°C warmer than March and about 4°C cooler than May.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
11911
21911
31911
41911
51911
61911
71912
82012
92012
102012
112012
122012
132012
142013
152113
162113
172113
182113
192113
202113
212113
222114
232214
242214
252214
262214
272214
282214
292215
302315

How April really feels in Ijūin

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.

Ijūin weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 82910.23.4
Feb13° / 1029.610.83.7
Mar16° / 15412.911.84.9
Apr21° / 13°17611.612.86.0
May24° / 17°19711.613.66.4
Jun27° / 21°48819.8144.7
Jul30° / 25°30019.913.93.7
Aug31° / 25°16717.213.23.6
Sep29° / 23°20214.712.24.9
Oct25° / 18°110911.27.1
Nov20° / 12°1128.910.46.4
Dec14° / 857.7104.6

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 10% of April, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34159
44060
54060
64060
74060
83961
93961
103961
113961
123961
133862
143862
153862
163961
173961
183961
193961
203961
213961
223961
233961
243961
254060
264060
274060
284060
293961
303961

Chance of precipitation in April

Any precipitation

Ijūin gets around 176 mm of rain over 11.6 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 39% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
338
438
538
637
737
838
938
1038
1139
1239
1340
1440
1541
1641
1741
1841
1941
2041
2141
2241
2341
2440
2540
2639
2739
2838
2937
3037

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
17814620
27715620
37515730
47416730
57316830
67217830
77117930
87018930
969181030
1068191030
1165201140
1265201140
1363211240
1462221240
1561221340
1660231340
1759231350
1859231350
1958241350
2057241360
2155251460
2255251460
2352261570
2451261580
2549271680
2648271690
2746271790
28452718101
29432818101
30422819111

Wind in April

Winds average 11 km/h in April.

Across April, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 18 min at the start of April to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over April. Sunrise moves from 6:14 AM to 5:40 AM, and sunset from 6:32 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:146:32
212.36:136:32
312.46:126:33
412.46:106:34
512.46:096:34
612.56:086:35
712.56:076:36
812.56:056:36
912.66:046:37
1012.66:036:38
1112.66:026:38
1212.66:006:39
1312.75:596:40
1412.75:586:40
1512.75:576:41
1612.85:556:42
1712.85:546:42
1812.85:536:43
1912.95:526:44
2012.95:516:45
2112.95:506:45
2213.05:486:46
2313.05:476:47
2413.05:466:47
2513.05:456:48
2613.15:446:49
2713.15:436:49
2813.15:426:50
2913.25:416:51
3013.25:406:52

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.89 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.06 kWh/m² in May across the year — April's 4.89 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.6Bright
34.6Bright
44.6Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in April

Hazard calendar for Ijūin

In seasonPeak

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

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

Ijūin's rainy season runs June–July, when most of the year's rain falls.

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

Is April a good time to visit Ijūin?

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

6.0
Sightseeing
4th-best month of the year
3.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Ijūin for sightseeing.

What to pack for Ijūin in April

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

In April, Ijūin sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Ijūin in April

The nearest coast averages about 19°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 26 km away) is warmest in August at about 28°C and coldest in February near 17°C.

It's comfortable for a long swim from May 4 to Dec 16 — about 7.5 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb17Cool
Mar18Cool
Apr19Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Tropical
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Refreshing

UV index in Ijūin in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ijūin peaks around July 10 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 10UV 11Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar7High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Ijūin 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 Ijūin is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1423 µg/m³Oct 1012 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb19Moderate
Mar22Moderate
Apr23Moderate
May21Moderate
Jun17Moderate
Jul12Moderate
Aug14Moderate
Sep12Moderate
Oct12Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Ijūin?

Ijūin sits at 31.6°N, 130.4°E, 93 m above sea level, in Japan. The nearest listed city is Umeki, 6.0 km away.

Topography around Ijūin

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

Within 3 km, the terrain around Ijūin has significant variations in elevation — a maximum elevation change of 261 m around an average of 127 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 681 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,644 m.

The land around Ijūin is covered by trees (75%) within 3 km, trees (64%) and water (20%) within 16 km, and water (54%) and trees (39%) within 80 km.

3 km
261 m
16 km
681 m
80 km
1,644 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Umeki 6.0 km · Kagoshima 15 km · Ichikikushikino 16 km · Kushikino 17 km · Kaseda-shirakame 24 km · Sendai 24 km · Aira 25 km · Minamisatsuma 28 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Ijūin (31.6167°, 130.4°, elevation 93 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).