Aki weather in April

In April, Aki sees average daytime highs of 18°C and overnight lows near 11°C, with 203 mm of rain across 11.6 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 16°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 Aki's 7th-clearest and 5th-windiest month. For the whole year in context, see Aki's year-round climate.

Daytime high
18°
7th warmest
Overnight low
11°
6th coldest
Rainfall
203 mm
11.6 wet days
Daylight
12 h 48 min
5:40 AM – 6:30 PM
Cloud cover
59%
7th clearest
Wind
11 km/h
5th windiest
Solar energy
5.37 kWh/m²
Travel score
5.4
out of 10

Aki is city in Kōchi Prefecture, Japan.

Density
52/km²
people per km²
Founded
1954

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 16°C in the first days to 19°C by the end.

A typical April day in Aki reaches about 18°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 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)
1169
2169
3169
4169
51610
61610
71610
81710
91710
101710
111711
121711
131711
141711
151811
161811
171811
181812
191812
201812
211812
221912
231912
241913
251913
261913
271913
281913
291913
302013

How April really feels in Aki

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.

Aki 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
Jan10° / 776.40.5102.3
Feb10° / 1017.80.910.82.5
Mar13° / 16711.20.111.73.8
Apr18° / 11°20311.6012.85.4
May21° / 16°23612.7013.76.0
Jun24° / 20°35819.1014.25.1
Jul27° / 23°35320.30144.7
Aug28° / 24°26119.6013.24.6
Sep26° / 21°30216.9012.25.5
Oct22° / 16°21711.3011.26.6
Nov17° / 11°1188.1010.35.8
Dec12° / 876.109.83.6

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 13% of April, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
25050
35050
45050
55050
65050
75050
85050
94951
104951
114951
124852
134852
144852
154654
164753
174654
184654
194654
204654
214654
224654
234654
244654
254654
264654
274555
284555
294555
304456

Chance of precipitation in April

Any precipitation

Aki gets around 203 mm of rain over 11.6 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 39% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
434
535
635
735
836
936
1037
1138
1239
1340
1440
1541
1642
1742
1843
1943
2042
2142
2242
2341
2441
2541
2640
2740
2839
2939
3039

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 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
191720
290820
390820
489920
5881020
6881020
7861130
8851131
9851131
10841231
11831331
12831331
13821431
14811531
15811531
16801631
17791731
18781741
19771841
20771841
21751951
22742051
23732061
24712171
25692281
26682291
27662392
286523102
296324112
306124123

Wind in April

Winds average 11 km/h in April.

Across April, daily wind ranges from about 10 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
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:00 AM to 5:23 AM, and sunset from 6:18 PM to 6:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:006:18
212.35:586:19
312.45:576:20
412.45:566:21
512.55:546:21
612.55:536:22
712.55:526:23
812.65:506:24
912.65:496:24
1012.65:476:25
1112.75:466:26
1212.75:456:27
1312.75:446:27
1412.85:426:28
1512.85:416:29
1612.85:406:30
1712.95:386:30
1812.95:376:31
1912.95:366:32
2013.05:356:33
2113.05:336:33
2213.05:326:34
2313.15:316:35
2413.15:306:36
2513.15:296:36
2613.25:286:37
2713.25:266:38
2813.25:256:39
2913.35:246:39
3013.35:236:40

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.37 kWh/m².

For context, solar energy here swings from a low near 2.64 kWh/m² to a high of 5.62 kWh/m² in May across the year — April's 5.37 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.1Bright
45.1Bright
55.1Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in April

Hazard calendar for Aki

In seasonPeak

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

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

Aki'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 Aki?

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

5.4
Sightseeing
5th-best month of the year
1.6
Beach & pool
7th-best month of the year

April is a reasonable time to visit Aki for sightseeing.

What to pack for Aki in April

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

In April, Aki sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Aki in April

The nearest coast averages about 19°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 14 km away) is warmest in August at about 28°C and coldest in February near 17°C.

It's comfortable for a long swim from May 3 to Dec 19 — about 7.6 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb17Cool
Mar18Cool
Apr19Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Refreshing

UV index in Aki in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aki peaks around June 23 at about 11 (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 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 23UV 11Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Aki 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 Aki 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 Aki?

Aki sits at 33.5°N, 133.9°E, 13 m above sea level, in Japan. The nearest listed city is Yamashita, 20 km away.

Topography around Aki

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

Within 3 km, the terrain around Aki has significant variations in elevation — a maximum elevation change of 426 m around an average of 37 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,031 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,939 m.

The land around Aki is covered by water (45%) and trees (23%) within 3 km, trees (53%) and water (42%) within 16 km, and trees (54%) and water (41%) within 80 km.

3 km
426 m
16 km
1,031 m
80 km
1,939 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Yamashita 20 km · Tosayamadachō-nakano 23 km · Nankoku 24 km · Muroto-misakicho 34 km · Kochi 34 km · Tosa 42 km · Ino 44 km · Susaki 58 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 Aki (33.5°, 133.9°, 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. 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).