Ashiya weather in May

In May, Ashiya sees average daytime highs of 23°C and overnight lows near 16°C, with 150 mm of rain across 10.7 wet days and about 13.8 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 25°C by the end. The sky is clear or mostly clear about 27% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of May to 14 h 06 min by month's end. Set against the rest of the year, May is Ashiya's 10th-clearest and 8th-windiest month. For the whole year in context, see Ashiya's year-round climate.

Daytime high
23°
5th warmest
Overnight low
16°
8th coldest
Rainfall
150 mm
10.7 wet days
Daylight
13 h 48 min
5:01 AM – 6:49 PM
Cloud cover
64%
10th clearest
Wind
10 km/h
8th windiest
Solar energy
5.52 kWh/m²
Travel score
6.6
out of 10

Ashiya is city in Hyōgo Prefecture, Japan.

Density
5,085/km²
people per km²
Founded
1940

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

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 25°C by the end.

A typical May day in Ashiya reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°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
32114
42114
52214
62214
72215
82215
92215
102215
112215
122315
132315
142316
152316
162316
172316
182316
192316
202416
212417
222417
232417
242417
252417
262417
272418
282418
292518
302518
312518

How May really feels in Ashiya

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.

Ashiya weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 556.20.49.91.8
Feb / 6570.810.72.1
Mar13° / 11110.40.111.73.6
Apr18° / 11°12410.5012.85.7
May23° / 16°15010.7013.86.6
Jun26° / 20°19613.5014.35.7
Jul30° / 24°20315.3014.14.3
Aug31° / 25°13113.6013.34.0
Sep28° / 22°19112.8012.25.6
Oct22° / 16°1599.6011.16.9
Nov17° / 10°867.4010.25.7
Dec11° / 666.709.73.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% 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
34654
44555
54456
64456
74357
84258
94258
104159
114159
124060
134159
144159
154060
164060
174060
184159
194159
204060
214060
224060
233961
243862
253862
263862
273763
283664
293565
303565
313367

Chance of precipitation in May

Any precipitation

Ashiya gets around 150 mm of rain over 10.7 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
132
232
333
433
533
634
734
834
935
1035
1135
1236
1336
1436
1536
1635
1735
1835
1934
2034
2134
2234
2333
2433
2533
2632
2732
2831
2931
3031
3131

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 40% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1642781
2622891
3612991
45830102
55631112
65532112
75333122
85333122
95134132
104935133
114835143
124736143
134537153
144438153
154239163
164040173
173940183
183741193
193541203
203442213
213242234
223042244
232942254
242742264
252542285
262441295
272241316
282140327
291939348
301837369
3117363710

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 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 42 minutes over May. Sunrise moves from 5:15 AM to 4:52 AM, and sunset from 6:37 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:156:37
213.45:146:38
313.45:136:39
413.55:116:40
513.55:106:41
613.55:096:41
713.65:086:42
813.65:086:43
913.65:076:44
1013.65:066:45
1113.75:056:45
1213.75:046:46
1313.75:036:47
1413.85:026:48
1513.85:016:49
1613.85:016:49
1713.85:006:50
1813.94:596:51
1913.94:596:52
2013.94:586:52
2113.94:576:53
2214.04:576:54
2314.04:566:55
2414.04:556:55
2514.04:556:56
2614.04:546:57
2714.14:546:58
2814.14:536:58
2914.14:536:59
3014.14:537:00
3114.14:527:00

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.52 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.52 kWh/m² in May across the year — May's 5.52 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Ashiya

In seasonPeak

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

Ashiya 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 Ashiya?

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
5.1
Beach & pool
5th-best month of the year

May is a reasonable time to visit Ashiya for sightseeing.

What to pack for Ashiya in May

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

In May, Ashiya sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Ashiya 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 at the nearest coast (about 13 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 6 to Nov 11 — about 5.2 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
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Ashiya 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 Ashiya peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 10UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Ashiya 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 Ashiya is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1625 µg/m³Oct 1914 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar24Moderate
Apr26Moderate
May24Moderate
Jun21Moderate
Jul22Moderate
Aug24Moderate
Sep17Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Ashiya?

Ashiya sits at 34.7°N, 135.3°E, 14 m above sea level, in Japan. The nearest listed city is Nishinomiya, 3.0 km away.

Topography around Ashiya

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

Within 3 km, the terrain around Ashiya has significant variations in elevation — a maximum elevation change of 493 m around an average of 56 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 931 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,714 m.

The land around Ashiya is covered by artificial surfaces (65%) within 3 km, artificial surfaces (36%), trees (30%) and water (30%) within 16 km, and trees (59%) and water (20%) within 80 km.

3 km
493 m
16 km
931 m
80 km
1,714 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Nishinomiya 3.0 km · Takarazuka 9.0 km · Amagasaki 11 km · Itami 11 km · Kobe 12 km · Kawanishi 14 km · Ikeda 16 km · Toyonaka 16 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 Ashiya (34.7281°, 135.3026°, elevation 14 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).