Akiruno weather in April

In April, Akiruno sees average daytime highs of 16°C and overnight lows near 7°C, with 146 mm of precipitation across 14.6 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 18°C by the end. The sky is clear or mostly clear about 27% 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 24 min by month's end. Set against the rest of the year, April is Akiruno's 7th-clearest and 1st-windiest month. For the whole year in context, see Akiruno's year-round climate.

Daytime high
16°
7th warmest
Overnight low
6th coldest
Precipitation
146 mm
14.6 wet days
Daylight
12 h 54 min
5:16 AM – 6:10 PM
Cloud cover
64%
7th clearest
Wind
8 km/h
1st windiest
Solar energy
4.82 kWh/m²
Travel score
4.5
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 14°C in the first days to 18°C by the end.

A typical April day in Akiruno reaches about 16°C in the afternoon and slips back to 7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 21°C. Set against its neighbours, April runs about 5°C warmer than March and about 4°C cooler than May.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1144
2145
3145
4145
5145
6155
7156
8156
9156
10156
11167
12167
13167
14167
15167
16168
17178
18178
19178
20178
21179
22179
23189
24189
25189
26189
271810
281910
291910
301910

How April really feels in Akiruno

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.

Akiruno 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 / -2°778.54.49.91.0
Feb / -1°759.64.610.61.2
Mar11° / 13915.24.711.72.5
Apr16° / 14614.60.912.94.5
May21° / 13°16615.6013.95.5
Jun23° / 17°22219.5014.44.9
Jul27° / 21°24321.8014.24.5
Aug28° / 22°20521013.44.4
Sep25° / 18°24918.3012.25.2
Oct19° / 13°24216.2011.15.2
Nov14° / 10111.30.210.14.1
Dec10° / 688.31.49.62.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24456
34456
44456
54357
64357
74456
84456
94357
104258
114258
124159
134159
144060
153961
163862
173862
183862
193961
203961
213961
223961
234060
244060
254060
264060
274159
284258
294258
304258

Chance of precipitation in April

Any precipitationSnow

Akiruno gets around 146 mm of rain and snow over 14.6 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 49% and peaks near 52% on the wettest days, and about 1 day brings snow.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
1508
2507
3507
4506
5506
6505
7505
8515
9514
10514
11514
12513
13513
14523
15523
16523
17523
18512
19512
20502
21492
22492
23482
24471
25471
26461
27451
28450
29450
30440

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 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
110000
210000
310000
410000
510000
610000
710000
810000
99901
109901
119901
129811
139811
149811
159811
169721
179721
189721
199631
209631
219541
229541
239451
249361
259271
269181
279091
2889101
2988111
3087121

Wind in April

Winds average 8 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 18 min at the start of April to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 5:38 AM to 4:59 AM, and sunset from 5:58 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:385:58
212.45:365:59
312.45:356:00
412.55:336:00
512.55:326:01
612.55:306:02
712.65:296:03
812.65:276:04
912.65:266:05
1012.75:256:05
1112.75:236:06
1212.85:226:07
1312.85:206:08
1412.85:196:09
1512.95:186:10
1612.95:166:10
1712.95:156:11
1813.05:136:12
1913.05:126:13
2013.05:116:14
2113.15:106:15
2213.15:086:15
2313.25:076:16
2413.25:066:17
2513.25:046:18
2613.35:036:19
2713.35:026:20
2813.35:016:21
2913.45:006:21
3013.44:596:22

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.82 kWh/m².

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 5.06 kWh/m² in May across the year — April's 4.82 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.9Bright
234.9Bright
244.9Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.1Bright
305.1Bright
Planning a trip in April

Hazard calendar for Akiruno

In seasonPeak

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

Akiruno 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 Akiruno?

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

4.5
Sightseeing
5th-best month of the year
0.9
Beach & pool
7th-best month of the year

April is a reasonable time to visit Akiruno for sightseeing.

What to pack for Akiruno in April

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

In April, Akiruno sees daytime highs around 16°C and nights near 7°C. Pack rain gear. Worth having: a warm layer and sun protection. About 15 days see rain.

rain geara warm layersun protection

Sea temperature near Akiruno 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 59 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Akiruno 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 Akiruno peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 16UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Akiruno 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 Akiruno is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Akiruno?

Akiruno sits at 35.7°N, 139.2°E, 163 m above sea level, in Japan. The nearest listed city is Itsukaichi, 1.0 km away.

Topography around Akiruno

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

Within 3 km, the terrain around Akiruno has significant variations in elevation — a maximum elevation change of 385 m around an average of 257 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,337 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Akiruno is covered by trees (76%) within 3 km, trees (72%) and artificial surfaces (23%) within 16 km, and trees (47%) and artificial surfaces (27%) within 80 km.

3 km
385 m
16 km
1,337 m
80 km
3,737 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Itsukaichi 1.0 km · Iwai 2.0 km · Ōme 6.0 km · Fussa 8.0 km · Hamura 9.0 km · Hachiōji 12 km · Hakonegasaki 12 km · Akishima 13 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 Akiruno (35.7285°, 139.2318°, elevation 163 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).