Kōzan weather in April

In April, Kōzan sees average daytime highs of 19°C and overnight lows near 9°C, with 110 mm of rain across 9.7 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 17°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 18 min by month's end. Set against the rest of the year, April is Kōzan's 4th-clearest and 5th-windiest month. For the whole year in context, see Kōzan's year-round climate.

Daytime high
19°
7th warmest
Overnight low
6th coldest
Rainfall
110 mm
9.7 wet days
Daylight
12 h 54 min
5:42 AM – 6:34 PM
Cloud cover
59%
4th clearest
Wind
9 km/h
5th windiest
Solar energy
5.23 kWh/m²
Travel score
6.0
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 17°C in the first days to 21°C by the end.

A typical April day in Kōzan reaches about 19°C in the afternoon and slips back to 9°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°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)
1166
2167
3177
4177
5177
6177
7178
8188
9188
10188
11188
12189
13199
14199
15199
16199
17199
181910
192010
202010
212010
222010
232011
242011
252111
262111
272111
282111
292112
302112

How April really feels in Kōzan

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.

Kōzan 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
Jan / 435.419.91.8
Feb10° / 547.21.410.72.2
Mar14° / 959.90.411.73.9
Apr19° / 1109.7012.86.0
May23° / 14°1299.9013.86.8
Jun26° / 19°19212.8014.35.8
Jul30° / 23°20713.7014.14.4
Aug32° / 24°12512.2013.33.9
Sep28° / 20°16011012.25.7
Oct22° / 13°1037.6011.17.2
Nov17° / 596.6010.25.7
Dec11° / 505.90.49.73.0

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 15% of April, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
45050
54852
64951
74951
84951
94852
104852
114852
124654
134654
144753
154654
164654
174654
184555
194555
204555
214555
224654
234654
244654
254654
264654
274654
284654
294654
304654

Chance of precipitation in April

Any precipitation

Kōzan gets around 110 mm of rain over 9.7 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
233
333
433
532
632
732
832
932
1032
1133
1233
1333
1433
1534
1634
1734
1834
1934
2033
2133
2232
2332
2431
2531
2631
2730
2830
2930
3030

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 (%)
196400
296400
395500
495500
595500
694600
793610
893610
993610
1093610
1193610
1293610
1392710
1492710
1592710
1692710
1791720
1890820
1990820
2089920
2189920
22871030
23861130
24851230
25831340
26821440
27811441
28791551
29781651
30771661

Wind in April

Winds average 9 km/h in April.

Across April, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:03 AM to 5:25 AM, and sunset from 6:22 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:036:22
212.46:016:23
312.46:006:24
412.45:586:25
512.55:576:25
612.55:566:26
712.55:546:27
812.65:536:28
912.65:516:28
1012.75:506:29
1112.75:496:30
1212.75:476:31
1312.85:466:32
1412.85:456:32
1512.85:436:33
1612.95:426:34
1712.95:416:35
1812.95:396:36
1913.05:386:36
2013.05:376:37
2113.05:366:38
2213.15:346:39
2313.15:336:40
2413.15:326:40
2513.25:316:41
2613.25:306:42
2713.25:286:43
2813.35:276:44
2913.35:266:44
3013.35:256:45

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.23 kWh/m².

For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 5.56 kWh/m² in May across the year — April's 5.23 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
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
265.4Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Kōzan

In seasonPeak

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

Kōzan sits in the Pacific typhoon belt; the season peaks July–October.

Kōzan's rainy season runs March–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Kōzan?

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

6.0
Sightseeing
3rd-best month of the year
2.6
Beach & pool
7th-best month of the year

April is a reasonable time to visit Kōzan for sightseeing.

What to pack for Kōzan in April

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

In April, Kōzan sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Kōzan 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 38 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 12 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep27Warm
Oct23Refreshing
Nov20Cool
Dec16Cool

UV index in Kōzan 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 Kōzan 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 Kōzan 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 Kōzan is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1322 µg/m³Oct 1711 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May20Moderate
Jun18Moderate
Jul14Moderate
Aug14Moderate
Sep12Good
Oct11Good
Nov12Good
Dec11Good
Location & terrain

Where is Kōzan?

Kōzan sits at 34.6°N, 133.1°E, 337 m above sea level, in Japan. The nearest listed city is Fuchūchō, 17 km away.

Topography around Kōzan

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

Within 3 km, the terrain around Kōzan has significant variations in elevation — a maximum elevation change of 315 m around an average of 432 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 710 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,264 m.

The land around Kōzan is covered by trees (72%) within 3 km, trees (85%) within 16 km, and trees (68%) and water (22%) within 80 km.

3 km
315 m
16 km
710 m
80 km
1,264 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Fuchūchō 17 km · Mihara 21 km · Shin’ichi 21 km · Onomichi 23 km · Shōbara 30 km · Takehara 30 km · Miyoshi 30 km · Fukuyama 31 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 Kōzan (34.5833°, 133.05°, elevation 337 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).