Itoshima weather in May

In May, Itoshima sees average daytime highs of 23°C and overnight lows near 16°C, with 141 mm of rain across 10 wet days and about 13.7 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 24°C by the end. The sky is clear or mostly clear about 29% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 13 h 18 min at the start of May to 14 hours by month's end. Set against the rest of the year, May is Itoshima's 8th-clearest and 11th-windiest month. For the whole year in context, see Itoshima's year-round climate.

Daytime high
23°
6th warmest
Overnight low
16°
7th coldest
Rainfall
141 mm
10 wet days
Daylight
13 h 42 min
5:24 AM – 7:07 PM
Cloud cover
64%
8th clearest
Wind
9 km/h
11th windiest
Solar energy
5.37 kWh/m²
Travel score
6.6
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 21°C in the first days to 24°C by the end.

A typical May day in Itoshima reaches about 23°C in the afternoon and slips back to 16°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12114
22114
32115
42115
52115
62115
72115
82215
92215
102216
112216
122216
132216
142216
152216
162316
172317
182317
192317
202317
212317
222317
232317
242418
252418
262418
272418
282418
292418
302418
312419

How May really feels in Itoshima

Once humidity and wind are folded in, May 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Itoshima weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 6410.11.3102.1
Feb11° / 699.60.910.82.4
Mar14° / 112110.111.73.8
Apr18° / 12°12610.4012.85.7
May23° / 16°14110013.76.6
Jun26° / 21°27814.9014.25.7
Jul29° / 25°26216.60144.4
Aug31° / 26°16315013.24.1
Sep27° / 22°18013012.25.8
Oct23° / 17°1017.7011.27.2
Nov17° / 12°888.9010.35.7
Dec12° / 729.90.39.83.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34654
44555
54456
64357
74258
84258
94159
104159
114159
124159
134159
144159
154159
164159
174159
184060
194159
204060
214060
224060
234060
244060
254060
264159
274060
283961
293961
303961
313961

Chance of precipitation in May

Any precipitation

Itoshima gets around 141 mm of rain over 10 wet days in May. 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%151015202531
Rain chance (%)
132
232
332
432
532
632
732
832
933
1033
1133
1233
1333
1433
1533
1633
1733
1832
1932
2032
2132
2232
2332
2432
2533
2633
2733
2833
2933
3033
3134

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the comfortable band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
151331330
249341430
347341440
446351540
544361640
642361750
741371750
839371850
938371960
1037381960
1135382060
1234392160
1332392170
1431392370
1529402470
1628402570
1726402670
1824402880
1922402980
2021403190
2119393290
22173933100
23163835111
24153736121
25133638131
26123439141
27113340161
2893141181
2983042191
3072842221
3172542242

Wind in May

Winds average 9 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 18 min at the start of May to 14 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over May. Sunrise moves from 5:37 AM to 5:15 AM, and sunset from 6:56 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:376:56
213.35:366:57
313.45:356:58
413.45:346:58
513.45:336:59
613.55:327:00
713.55:317:01
813.55:307:01
913.55:297:02
1013.65:287:03
1113.65:277:04
1213.65:277:04
1313.75:267:05
1413.75:257:06
1513.75:247:07
1613.75:247:07
1713.85:237:08
1813.85:227:09
1913.85:217:10
2013.85:217:10
2113.85:207:11
2213.95:207:12
2313.95:197:13
2413.95:197:13
2513.95:187:14
2614.05:187:15
2714.05:177:15
2814.05:177:16
2914.05:167:17
3014.05:167:17
3114.05:157:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.37 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.14 kWh/m² to a high of 5.37 kWh/m² in May across the year — May's 5.37 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.3Bright
Planning a trip in May

Hazard calendar for Itoshima

In seasonPeak

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

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

Itoshima's rainy season runs April–September, 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 May a good time to visit Itoshima?

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

6.6
Sightseeing
2nd-best month of the year
4.9
Beach & pool
6th-best month of the year

May is a reasonable time to visit Itoshima for sightseeing.

What to pack for Itoshima in May

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

In May, Itoshima sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Itoshima in May

The nearest coast averages about 18°C in May — 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 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 9 to Nov 20 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul24Warm
Aug27Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec18Cool

UV index in Itoshima in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Itoshima 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
Jun7Very high
Jul9Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Itoshima in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Itoshima is worst in April — around 25 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1225 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar25Moderate
Apr25Moderate
May23Moderate
Jun18Moderate
Jul13Moderate
Aug15Moderate
Sep13Moderate
Oct12Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Itoshima?

Itoshima sits at 33.5°N, 130.2°E, 77 m above sea level, in Japan. The nearest listed city is Maebaru-chūō, 2.0 km away.

Topography around Itoshima

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

Within 3 km, the terrain around Itoshima has only modest variations in elevation — a maximum elevation change of 163 m around an average of 22 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 970 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,212 m.

The land around Itoshima is covered by trees (34%), cropland (26%) and artificial surfaces (25%) within 3 km, trees (46%) and water (37%) within 16 km, and water (51%) and trees (34%) within 80 km.

3 km
163 m
16 km
970 m
80 km
1,212 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Maebaru-chūō 2.0 km · Katanawa 22 km · Fukuoka 22 km · Karatsu 23 km · Kasuga 26 km · Ōnojō 27 km · Shime 28 km · Ishinari 29 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 Itoshima (33.5423°, 130.1842°, elevation 77 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).