Itogawa weather in May

In May, Itogawa sees average daytime highs of 21°C and overnight lows near 16°C, with 160 mm of rain across 11 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 20°C in the first days to 23°C by the end. The sky is clear or mostly clear about 26% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of May to 14 h 06 min by month's end. Set against the rest of the year, May is Itogawa's 10th-clearest and 8th-windiest month. For the whole year in context, see Itogawa's year-round climate.

Daytime high
21°
6th warmest
Overnight low
16°
7th coldest
Rainfall
160 mm
11 wet days
Daylight
13 h 48 min
5:02 AM – 6:48 PM
Cloud cover
65%
10th clearest
Wind
13 km/h
8th windiest
Solar energy
5.59 kWh/m²
Travel score
6.3
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 23°C by the end.

A typical May day in Itogawa reaches about 21°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 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12014
22014
32014
42014
52014
62014
72114
82115
92115
102115
112115
122115
132115
142115
152115
162116
172216
182216
192216
202216
212216
222216
232216
242217
252217
262317
272317
282317
292317
302317
312317

How May really feels in Itogawa

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.

Itogawa 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
Jan / 8711.22.3101.8
Feb10° / 9410.8210.72.1
Mar13° / 13812.80.311.73.5
Apr17° / 11°13911.3012.85.4
May21° / 16°16011013.76.3
Jun24° / 20°26514.9014.25.7
Jul28° / 24°22414.30145.3
Aug29° / 25°13213013.35.0
Sep27° / 22°19113.3012.25.9
Oct22° / 16°19511.1011.16.6
Nov17° / 11°1108.7010.25.5
Dec12° / 91101.19.83.1

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14654
24654
34555
44555
54456
64357
74258
84159
94159
103961
113961
123961
133961
143961
153961
163961
173961
184060
194060
204060
213961
224060
234060
244060
254060
263961
273862
283862
293763
303664
313565

Chance of precipitation in May

Any precipitation

Itogawa gets around 160 mm of rain over 11 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 35% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
234
334
434
535
635
735
835
936
1036
1136
1236
1336
1436
1536
1636
1735
1835
1935
2034
2134
2234
2334
2434
2534
2634
2734
2834
2935
3035
3136

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
163251020
261261120
359271130
458281130
557281230
655291240
754301240
852311340
951311350
1050321350
1149331350
1247341360
1346351360
1445361460
1543371460
1642381560
1740391560
1839391660
1937401760
2036401860
2134401960
2233412160
2331412260
2429412360
2527412560
2626412770
2724402870
2822403070
2921393280
3019383491
31173735101

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 18 min at the start of May to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over May. Sunrise moves from 5:16 AM to 4:54 AM, and sunset from 6:36 PM to 6:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:166:36
213.45:156:37
313.45:146:38
413.45:136:39
513.55:126:40
613.55:116:40
713.55:106:41
813.55:096:42
913.65:086:43
1013.65:076:44
1113.65:066:44
1213.75:056:45
1313.75:056:46
1413.75:046:47
1513.75:036:47
1613.85:026:48
1713.85:026:49
1813.85:016:50
1913.85:006:50
2013.95:006:51
2113.94:596:52
2213.94:586:53
2313.94:586:53
2413.94:576:54
2514.04:576:55
2614.04:566:55
2714.04:566:56
2814.04:556:57
2914.04:556:57
3014.14:546:58
3114.14:546:59

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.59 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 5.59 kWh/m² in May across the year — May's 5.59 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Itogawa

In seasonPeak

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

Itogawa 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 May a good time to visit Itogawa?

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

6.3
Sightseeing
2nd-best month of the year
4.1
Beach & pool
6th-best month of the year

May is a reasonable time to visit Itogawa for sightseeing.

What to pack for Itogawa in May

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

In May, Itogawa sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Itogawa in May

The nearest coast averages about 19°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from May 31 to Nov 23 — about 5.8 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb14Bracing
Mar15Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec18Cool

UV index in Itogawa in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Itogawa peaks around June 23 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 highModerateJun 23UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug7High
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Itogawa 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 Itogawa is worst in April — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1319 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar19Moderate
Apr19Moderate
May17Moderate
Jun14Moderate
Jul10Good
Aug10Good
Sep10Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Itogawa?

Itogawa sits at 34.0°N, 135.3°E, 129 m above sea level, in Japan. The nearest listed city is Arida, 14 km away.

Topography around Itogawa

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

Within 3 km, the terrain around Itogawa has significant variations in elevation — a maximum elevation change of 599 m around an average of 261 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 946 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,879 m.

The land around Itogawa is covered by trees (95%) within 3 km, trees (82%) within 16 km, and trees (47%) and water (43%) within 80 km.

3 km
599 m
16 km
946 m
80 km
1,879 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Arida 14 km · Kainan 14 km · Gobō 18 km · Minato 23 km · Wakayama 24 km · Iwade 26 km · Kinokawa 31 km · Hannan 34 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 Itogawa (34.0262°, 135.2528°, elevation 129 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).