Innoshima weather in April

In April, Innoshima sees average daytime highs of 17°C and overnight lows near 12°C, with 112 mm of rain across 10.4 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 19°C by the end. The sky is clear or mostly clear about 34% 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 18 min by month's end. Set against the rest of the year, April is Innoshima's 5th-clearest and 7th-windiest month. For the whole year in context, see Innoshima's year-round climate.

Daytime high
17°
7th warmest
Overnight low
12°
5th coldest
Rainfall
112 mm
10.4 wet days
Daylight
12 h 54 min
5:42 AM – 6:33 PM
Cloud cover
58%
5th clearest
Wind
12 km/h
7th windiest
Solar energy
5.24 kWh/m²
Travel score
5.4
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 15°C in the first days to 19°C by the end.

A typical April day in Innoshima reaches about 17°C in the afternoon and slips back to 12°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 20°C. Set against its neighbours, April runs about 4°C warmer than March and about 4°C cooler than May.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11510
21510
31510
41510
51611
61611
71611
81611
91611
101611
111712
121712
131712
141712
151712
161712
171712
181813
191813
201813
211813
221813
231813
241814
251914
261914
271914
281914
291914
301914

How April really feels in Innoshima

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.

Innoshima weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 6311.30.6102.0
Feb10° / 6910.20.710.72.2
Mar13° / 10311.1011.73.5
Apr17° / 12°11210.4012.85.4
May21° / 16°1299.9013.86.5
Jun24° / 20°19212.3014.26.1
Jul28° / 24°17111.2014.15.7
Aug30° / 26°938.4013.35.3
Sep27° / 23°15310.7012.26.3
Oct22° / 18°1278.8011.17.0
Nov17° / 12°678.2010.25.6
Dec12° / 7110.60.29.83.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35149
45149
55149
65149
75149
85050
95050
105050
115050
124852
134852
144852
154753
164852
174654
184654
194654
204654
214654
224654
234852
244852
254852
264852
274852
284852
294951
304951

Chance of precipitation in April

Any precipitation

Innoshima gets around 112 mm of rain over 10.4 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 34% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
334
434
534
634
734
834
935
1035
1135
1236
1336
1436
1537
1637
1737
1836
1936
2036
2135
2235
2334
2434
2533
2633
2732
2832
2931
3031

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 81% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
194600
293700
393700
492800
591900
690910
7891010
8891010
9881110
10881110
11871210
12871210
13861310
14851410
15841420
16831520
17821620
18821620
19801730
20791830
21781930
22762040
23742240
24722350
25702550
26682660
27652771
28632881
29612991
30612991

Wind in April

Winds average 12 km/h in April.

Across April, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2811calm
2911calm
3011calm

Sunrise & sunset in April

DaylightNight

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

Days grow by about 60 minutes over April. Sunrise moves from 6:02 AM to 5:25 AM, and sunset from 6:22 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:026:22
212.46:016:22
312.45:596:23
412.45:586:24
512.55:576:25
612.55:556:25
712.55:546:26
812.65:536:27
912.65:516:28
1012.65:506:28
1112.75:486:29
1212.75:476:30
1312.85:466:31
1412.85:446:32
1512.85:436:32
1612.95:426:33
1712.95:416:34
1812.95:396:35
1913.05:386:36
2013.05:376:36
2113.05:356:37
2213.15:346:38
2313.15:336:39
2413.15:326:40
2513.25:316:40
2613.25:296:41
2713.25:286:42
2813.35:276:43
2913.35:266:43
3013.35:256:44

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.24 kWh/m².

For context, solar energy here swings from a low near 2.29 kWh/m² to a high of 5.58 kWh/m² in May across the year — April's 5.24 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Innoshima

In seasonPeak

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

Innoshima 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 Innoshima?

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

5.4
Sightseeing
7th-best month of the year
1.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Innoshima for sightseeing.

What to pack for Innoshima in April

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

In April, Innoshima sees daytime highs around 17°C and nights near 12°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Innoshima in April

The nearest coast averages about 15°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 February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 14 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug28Warm
Sep27Warm
Oct24Refreshing
Nov20Cool
Dec17Cool

UV index in Innoshima 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 Innoshima peaks around July 15 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 15UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Innoshima 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 Innoshima is worst in April — around 24 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1324 µg/m³Dec 1414 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May22Moderate
Jun20Moderate
Jul17Moderate
Aug17Moderate
Sep16Moderate
Oct14Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Innoshima?

Innoshima sits at 34.3°N, 133.2°E, 33 m above sea level, in Japan. The nearest listed city is Onomichi, 15 km away.

Topography around Innoshima

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

Within 3 km, the terrain around Innoshima has significant variations in elevation — a maximum elevation change of 379 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 473 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,900 m.

The land around Innoshima is covered by water (45%) and trees (40%) within 3 km, water (66%) and trees (27%) within 16 km, and trees (62%) and water (26%) within 80 km.

3 km
379 m
16 km
473 m
80 km
1,900 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Onomichi 15 km · Mihara 16 km · Takehara 25 km · Fukuyama 28 km · Imabari 29 km · Shin’ichi 31 km · Fuchūchō 33 km · Kōzan 36 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 Innoshima (34.2833°, 133.1833°, elevation 33 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).