Yōkaichiba weather in April

In April, Yōkaichiba sees average daytime highs of 17°C and overnight lows near 11°C, with 112 mm of rain across 12.6 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 15°C in the first days to 19°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 24 min by month's end. Set against the rest of the year, April is Yōkaichiba's 7th-clearest and 1st-windiest month. For the whole year in context, see Yōkaichiba's year-round climate.

Daytime high
17°
7th warmest
Overnight low
11°
5th coldest
Rainfall
112 mm
12.6 wet days
Daylight
12 h 54 min
5:11 AM – 6:05 PM
Cloud cover
62%
7th clearest
Wind
15 km/h
1st windiest
Solar energy
5.01 kWh/m²
Travel score
5.2
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 Yōkaichiba reaches about 17°C in the afternoon and slips back to 11°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 13°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)
1159
2159
3159
4169
5169
61610
71610
81610
91610
101710
111710
121711
131711
141711
151711
161711
171811
181812
191812
201812
211812
221812
231912
241913
251913
261913
271913
281913
292013
302014

How April really feels in Yōkaichiba

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.

Yōkaichiba 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 / 828.70.79.92.1
Feb10° / 7790.810.62.3
Mar13° / 13013.10.511.73.4
Apr17° / 11°11212.6012.95.2
May21° / 16°12811.7013.96.1
Jun24° / 19°15913.2014.45.9
Jul28° / 23°14213.3014.25.4
Aug29° / 24°10111.1013.35.1
Sep26° / 22°16814012.25.8
Oct21° / 17°20913.2011.16.1
Nov17° / 11°10910.9010.15.2
Dec12° / 779.409.63.3

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 15% of April, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24555
34555
44555
54555
64654
74456
84456
94456
104456
114456
124357
134357
144357
154357
164357
174258
184357
194357
204357
214357
224357
234357
244357
254357
264357
274357
284456
294456
304357

Chance of precipitation in April

Any precipitation

Yōkaichiba gets around 112 mm of rain over 12.6 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 42% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
144
244
344
444
544
644
744
844
944
1044
1143
1243
1343
1442
1542
1642
1741
1841
1941
2041
2140
2240
2340
2440
2539
2639
2739
2838
2938
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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
196400
296400
395500
494510
593610
693610
793610
892710
992710
1091810
1191810
1290910
1390910
14891010
15881110
16881110
17861220
18851320
19831421
20821521
21811621
22791731
23781831
24762031
25742141
26732241
27712351
28682561
29662671
30652771

Wind in April

Winds average 15 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

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 5:32 AM to 4:53 AM, and sunset from 5:53 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:325:53
212.45:315:53
312.45:295:54
412.55:285:55
512.55:265:56
612.55:255:57
712.65:245:58
812.65:225:58
912.65:215:59
1012.75:196:00
1112.75:186:01
1212.85:166:02
1312.85:156:03
1412.85:146:03
1512.95:126:04
1612.95:116:05
1712.95:106:06
1813.05:086:07
1913.05:076:08
2013.05:066:08
2113.15:046:09
2213.15:036:10
2313.25:026:11
2413.25:006:12
2513.24:596:13
2613.34:586:14
2713.34:576:14
2813.34:566:15
2913.44:546:16
3013.44:536:17

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.01 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.44 kWh/m² in May across the year — April's 5.01 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.3Bright
275.3Bright
285.3Bright
295.4Bright
305.4Bright
Planning a trip in April

Hazard calendar for Yōkaichiba

In seasonPeak

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

Yōkaichiba 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 Yōkaichiba?

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

5.2
Sightseeing
6th-best month of the year
1.5
Beach & pool
7th-best month of the year

April is a reasonable time to visit Yōkaichiba for sightseeing.

What to pack for Yōkaichiba in April

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

In April, Yōkaichiba sees daytime highs around 17°C and nights near 11°C. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Yōkaichiba 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 offshore is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr16Cool
May19Cool
Jun21Refreshing
Jul23Refreshing
Aug25Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Yōkaichiba 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 Yōkaichiba peaks around August 12 at about 10 (extreme) — 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 highVery highModerateAug 12UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Yōkaichiba 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 Yōkaichiba is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Yōkaichiba?

Yōkaichiba sits at 35.7°N, 140.6°E, 10 m above sea level, in Japan. The nearest listed city is Sōsa, 2.0 km away.

Topography around Yōkaichiba

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

Within 3 km, the terrain around Yōkaichiba has only modest variations in elevation — a maximum elevation change of 53 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 72 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.

The land around Yōkaichiba is covered by trees (39%), cropland (37%) and artificial surfaces (20%) within 3 km, cropland (31%), trees (30%) and water (22%) within 16 km, and water (42%) and trees (24%) within 80 km.

3 km
53 m
16 km
72 m
80 km
840 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Sōsa 2.0 km · Yokoshiba 8.0 km · Asahi 9.0 km · Sanmu 14 km · Narutō 16 km · Ryōgoku 17 km · Omigawa 18 km · Sawara 21 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 Yōkaichiba (35.7°, 140.55°, 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).