Ishii weather in April

In April, Ishii sees average daytime highs of 17°C and overnight lows near 11°C, with 151 mm of rain across 11.3 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 7th-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 Ishii's 6th-clearest and 5th-windiest month. For the whole year in context, see Ishii's year-round climate.

Daytime high
17°
7th warmest
Overnight low
11°
6th coldest
Rainfall
151 mm
11.3 wet days
Daylight
12 h 48 min
5:37 AM – 6:28 PM
Cloud cover
58%
6th clearest
Wind
13 km/h
5th windiest
Solar energy
5.25 kWh/m²
Travel score
5.3
out of 10

Ishii is town in Myōzai district, Tokushima prefecture, Japan.

Density
869/km²
people per km²
Founded
1907

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 15°C in the first days to 19°C by the end.

A typical April day in Ishii reaches about 17°C in the afternoon and slips back to 11°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°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)
1158
2159
3159
4169
5169
6169
7169
81610
91610
101710
111710
121710
131710
141711
151711
161711
171811
181811
191811
201812
211812
221812
231812
241912
251912
261912
271913
281913
291913
301913

How April really feels in Ishii

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.

Ishii weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 717.31.1101.9
Feb10° / 798.41.310.72.2
Mar13° / 12811.60.211.73.5
Apr17° / 11°15111.3012.85.3
May21° / 15°19112.9013.76.0
Jun24° / 19°27716.8014.25.4
Jul28° / 23°26117.80144.9
Aug29° / 24°20416013.34.8
Sep26° / 21°28615.5012.25.8
Oct21° / 16°23111.7011.16.4
Nov16° / 11°1058.2010.25.4
Dec11° / 8170.19.83.2

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 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35149
45149
55050
65050
75050
85050
95050
104951
114951
124951
134951
144951
154852
164753
174753
184753
194753
204753
214852
224852
234753
244753
254753
264753
274753
284753
294654
304654

Chance of precipitation in April

Any precipitation

Ishii gets around 151 mm of rain over 11.3 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 38% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
237
337
437
537
636
736
837
937
1037
1137
1238
1338
1439
1539
1640
1740
1840
1940
2040
2140
2240
2339
2439
2539
2639
2738
2838
2938
3038

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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
193610
293610
392620
491720
591720
690820
790820
890820
989920
1089920
11881020
12881020
13871120
14871120
15851221
16831331
17831331
18821431
19821431
20821530
21801640
22791740
23771850
24761950
25742060
26732061
27712171
28702271
29682381
30682381

Wind in April

Winds average 13 km/h in April.

Across April, daily wind ranges from about 12 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
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze

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 5:57 AM to 5:20 AM, and sunset from 6:16 PM to 6:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:576:16
212.45:566:17
312.45:556:18
412.45:536:19
512.55:526:19
612.55:506:20
712.55:496:21
812.65:486:22
912.65:466:23
1012.65:456:23
1112.75:446:24
1212.75:426:25
1312.75:416:26
1412.85:406:26
1512.85:386:27
1612.85:376:28
1712.95:366:29
1812.95:346:29
1913.05:336:30
2013.05:326:31
2113.05:316:32
2213.15:296:33
2313.15:286:33
2413.15:276:34
2513.25:266:35
2613.25:256:36
2713.25:246:37
2813.25:226:37
2913.35:216:38
3013.35:206:39

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.25 kWh/m².

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 5.5 kWh/m² in May across the year — April's 5.25 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
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Ishii

In seasonPeak

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

Ishii 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 Ishii?

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

5.3
Sightseeing
6th-best month of the year
1.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Ishii for sightseeing.

What to pack for Ishii in April

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

In April, Ishii sees daytime highs around 17°C and nights near 11°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Ishii in April

The nearest coast averages about 16°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 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 5 to Nov 19 — about 5.5 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov20Refreshing
Dec17Cool

UV index in Ishii 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 Ishii peaks around July 11 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 11UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Ishii 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 Ishii is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (September, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1320 µg/m³Sep 2010 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec11Good
Location & terrain

Where is Ishii?

Ishii sits at 34.1°N, 134.4°E, 10 m above sea level, in Japan. The nearest listed city is Kamojimachō-jōgejima, 8.0 km away.

Topography around Ishii

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

Within 3 km, the terrain around Ishii has only modest variations in elevation — a maximum elevation change of 208 m around an average of 34 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,024 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,941 m.

The land around Ishii is covered by artificial surfaces (34%), trees (31%) and cropland (29%) within 3 km, trees (60%) within 16 km, and water (49%) and trees (42%) within 80 km.

3 km
208 m
16 km
1,024 m
80 km
1,941 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Kamojimachō-jōgejima 8.0 km · Yakami 10 km · Takabō 11 km · Tokushima 11 km · Yoshinogawa 14 km · Awa 15 km · Komatsushimachō 15 km · Higashikagawa 19 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 Ishii (34.0675°, 134.4421°, elevation 10 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).