Shiraoka weather in April

In April, Shiraoka sees average daytime highs of 19°C and overnight lows near 9°C, with 105 mm of precipitation across 11.1 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 16°C in the first days to 21°C by the end. The sky is clear or mostly clear about 32% 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 Shiraoka's 7th-clearest and 1st-windiest month. For the whole year in context, see Shiraoka's year-round climate.

Daytime high
19°
7th warmest
Overnight low
6th coldest
Precipitation
105 mm
11.1 wet days
Daylight
12 h 54 min
5:14 AM – 6:09 PM
Cloud cover
60%
7th clearest
Wind
11 km/h
1st windiest
Solar energy
4.83 kWh/m²
Travel score
5.8
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 21°C by the end.

A typical April day in Shiraoka reaches about 19°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 23°C. Set against its neighbours, April runs about 5°C warmer than March and about 5°C cooler than May.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1167
2167
3167
4177
5177
6178
7178
8178
9188
10188
11189
12189
13189
14199
15199
161910
171910
181910
191910
202010
212011
222011
232011
242011
252011
262112
272112
282112
292112
302112

How April really feels in Shiraoka

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.

Shiraoka 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 / 576.11.59.82.2
Feb10° / 546.81.610.62.5
Mar14° / 9910.80.811.73.9
Apr19° / 10511.10.112.95.8
May23° / 15°12812.2013.96.4
Jun26° / 19°15214.1014.45.6
Jul30° / 23°15914.7014.24.4
Aug31° / 24°11812.3013.44.0
Sep27° / 21°17213.7012.25.5
Oct22° / 14°19012.6011.16.2
Nov16° / 819.2010.15.4
Dec12° / 526.50.29.63.4

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 13% of April, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35050
45050
55050
65050
74852
84852
94852
104753
114753
124555
134456
144456
154456
164357
174357
184357
194357
204357
214357
224357
234357
244456
254456
264456
274456
284456
294456
304456

Chance of precipitation in April

Any precipitation

Shiraoka gets around 105 mm of rain and snow over 11.1 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 37% and peaks near 39% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
337
438
538
638
739
839
939
1039
1139
1239
1339
1439
1539
1639
1739
1839
1938
2038
2137
2237
2336
2436
2536
2635
2735
2835
2934
3034

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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
199100
298200
398200
498200
597300
697300
797300
896400
996400
1095410
1194510
1294510
1393610
1493610
1592710
1691720
1790820
1890820
1988921
20871021
21861121
22851221
23831331
24821431
25801631
26781741
27771841
28751951
29742051
30722161

Wind in April

Winds average 11 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 11 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
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:36 AM to 4:56 AM, and sunset from 5:56 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:365:56
212.45:345:57
312.45:335:58
412.55:315:59
512.55:306:00
612.55:286:00
712.65:276:01
812.65:256:02
912.65:246:03
1012.75:236:04
1112.75:216:05
1212.85:206:06
1312.85:186:06
1412.85:176:07
1512.95:166:08
1612.95:146:09
1713.05:136:10
1813.05:116:11
1913.05:106:12
2013.15:096:12
2113.15:076:13
2213.15:066:14
2313.25:056:15
2413.25:046:16
2513.25:026:17
2613.35:016:18
2713.35:006:18
2813.34:596:19
2913.44:586:20
3013.44:566:21

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.83 kWh/m².

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.04 kWh/m² in May across the year — April's 4.83 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.1Bright
305.1Bright
Planning a trip in April

Is April a good time to visit Shiraoka?

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

5.8
Sightseeing
3rd-best month of the year
2.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Shiraoka for sightseeing.

What to pack for Shiraoka in April

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

In April, Shiraoka sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Shiraoka 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 48 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 Shiraoka in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Shiraoka peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Shiraoka 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 Shiraoka 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 Shiraoka?

Shiraoka sits at 36.0°N, 139.7°E, 13 m above sea level, in Japan. The nearest listed city is Shinden, 4.0 km away.

Topography around Shiraoka

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

Within 3 km, the terrain around Shiraoka has only modest variations in elevation — a maximum elevation change of 22 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 48 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,253 m.

The land around Shiraoka is covered by artificial surfaces (52%) and cropland (30%) within 3 km, artificial surfaces (50%) and cropland (34%) within 16 km, and trees (44%) and artificial surfaces (29%) within 80 km.

3 km
22 m
16 km
48 m
80 km
2,253 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Shinden 4.0 km · Hasuda 5.0 km · Kukichūō 6.0 km · Sugito 6.0 km · Miyashiro 6.0 km · Ageo 7.0 km · Iwatsuki 7.0 km · Shōbu 8.0 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 Shiraoka (36.0184°, 139.6603°, elevation 13 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. 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).