Iki weather in April

In April, Iki sees average daytime highs of 16°C and overnight lows near 14°C, with 134 mm of rain across 10.1 wet days and about 12.8 hours of daylight. It is the 8th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 17°C by the end. The sky is clear or mostly clear about 37% 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 Iki's 5th-clearest and 8th-windiest month. For the whole year in context, see Iki's year-round climate.

Daytime high
16°
8th warmest
Overnight low
14°
5th coldest
Rainfall
134 mm
10.1 wet days
Daylight
12 h 48 min
5:56 AM – 6:47 PM
Cloud cover
57%
5th clearest
Wind
22 km/h
8th windiest
Solar energy
5.22 kWh/m²
Travel score
4.9
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 17°C by the end.

A typical April day in Iki reaches about 16°C in the afternoon and slips back to 14°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 18°C. Set against its neighbours, April runs about 3°C warmer than March and about 3°C cooler than May.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11412
21412
31412
41412
51512
61512
71513
81513
91513
101513
111513
121513
131513
141613
151614
161614
171614
181614
191614
201614
211614
221614
231615
241715
251715
261715
271715
281715
291715
301715

How April really feels in Iki

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.

Iki weather by month

How April compares with the rest of the year at a glance. April is the 8th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 7811.90.5102.2
Feb11° / 7810.20.410.72.4
Mar13° / 10°12611.2011.73.4
Apr16° / 14°13410.1012.84.9
May19° / 17°1389.5013.76.1
Jun22° / 21°25112.6014.25.9
Jul26° / 24°24312.90146.2
Aug27° / 26°15811.2013.36.3
Sep25° / 24°17111.2012.26.6
Oct21° / 20°1007.6011.17.1
Nov17° / 15°979.2010.25.7
Dec13° / 10°79110.29.83.4

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 12% of April, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24951
34852
44852
54951
64753
74753
84753
94753
104753
114753
124654
134753
144753
154753
164753
174753
184951
194951
205050
215050
225050
235050
245050
255050
265050
274951
284951
294951
304852

Chance of precipitation in April

Any precipitation

Iki gets around 134 mm of rain over 10.1 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 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
134
234
334
433
533
633
733
833
933
1033
1133
1233
1333
1433
1533
1633
1734
1834
1934
2034
2134
2234
2334
2434
2534
2634
2734
2833
2933
3033

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 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1891100
2881200
3871300
4871300
5861400
6841510
7831610
8821710
9811810
10801910
11782020
12772120
13762220
14752320
15742330
16732430
17722530
18702640
19692740
20682840
21662950
22643150
23623260
24593470
25563581
26543691
275237101
285038111
294839121
304540131

Wind in April

Winds average 22 km/h in April.

Across April, daily wind ranges from about 21 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
124breezy
224breezy
324breezy
423breezy
523breezy
623breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1523breezy
1623breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2322breezy
2422breezy
2522breezy
2621breezy
2721breezy
2821breezy
2921breezy
3021breezy

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 6:16 AM to 5:40 AM, and sunset from 6:35 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:166:35
212.36:156:36
312.46:146:37
412.46:126:37
512.56:116:38
612.56:096:39
712.56:086:40
812.66:076:40
912.66:056:41
1012.66:046:42
1112.76:036:43
1212.76:016:44
1312.76:006:44
1412.85:596:45
1512.85:576:46
1612.85:566:47
1712.95:556:47
1812.95:546:48
1912.95:526:49
2013.05:516:50
2113.05:506:50
2213.05:496:51
2313.15:476:52
2413.15:466:53
2513.15:456:53
2613.25:446:54
2713.25:436:55
2813.25:426:56
2913.35:416:57
3013.35:406:57

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.22 kWh/m².

For context, solar energy here swings from a low near 2.19 kWh/m² to a high of 5.6 kWh/m² in May across the year — April's 5.22 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in April

Hazard calendar for Iki

In seasonPeak

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

Iki 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 Iki?

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

4.9
Sightseeing
8th-best month of the year
0.6
Beach & pool
8th-best month of the year

April is a reasonable time to visit Iki for sightseeing.

What to pack for Iki in April

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

In April, Iki sees daytime highs around 16°C and nights near 14°C. Worth packing: a warm layer, rain gear, sun protection and a windbreaker. About 10 days see rain.

a warm layerrain gearsun protectiona windbreaker

Sea temperature near Iki 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 at the nearest coast (about 14 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 6 to Nov 26 — about 5.7 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Iki 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 Iki peaks around July 23 at about 9 (very high) — 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 highModerateJul 23UV 9Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Iki 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 Iki is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (July, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 924 µg/m³Jul 2211 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar24Moderate
Apr24Moderate
May21Moderate
Jun16Moderate
Jul11Good
Aug11Good
Sep12Good
Oct11Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Iki?

Iki sits at 33.8°N, 129.7°E, 45 m above sea level, in Japan. The nearest listed city is Karatsu, 44 km away.

Topography around Iki

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

Within 3 km, the terrain around Iki has only modest variations in elevation — a maximum elevation change of 152 m around an average of 64 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 208 m; within 80 km, large variations in elevation — a maximum elevation change of 1,043 m.

The land around Iki is covered by trees (72%) within 3 km, water (83%) within 16 km, and water (77%) within 80 km.

3 km
152 m
16 km
208 m
80 km
1,043 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Karatsu 44 km · Hirado 49 km · Matsuura 49 km · Itoshima 51 km · Maebaru-chūō 51 km · Imarichō-kō 58 km · Tsushima 62 km · Shingū 66 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 Iki (33.7829°, 129.7209°, elevation 45 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).