Shūnan weather in May

In May, Shūnan sees average daytime highs of 21°C and overnight lows near 15°C, with 169 mm of rain across 10.1 wet days and about 13.7 hours of daylight. It is the 6th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 22°C by the end. The sky is clear or mostly clear about 31% 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 Shūnan's 8th-clearest and 8th-windiest month. For the whole year in context, see Shūnan's year-round climate.

Daytime high
21°
6th warmest
Overnight low
15°
7th coldest
Rainfall
169 mm
10.1 wet days
Daylight
13 h 48 min
5:16 AM – 7:02 PM
Cloud cover
61%
8th clearest
Wind
12 km/h
8th windiest
Solar energy
5.52 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 19°C in the first days to 22°C by the end.

A typical May day in Shūnan reaches about 21°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 23°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11913
21913
31914
41914
51914
61914
72014
82014
92014
102015
112015
122015
132015
142015
152015
162115
172115
182116
192116
202116
212116
222116
232116
242116
252216
262217
272217
282217
292217
302217
312217

How May really feels in Shūnan

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.

Shūnan weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 629.31.3101.7
Feb / 769.51.110.72.0
Mar12° / 12410.70.211.73.3
Apr17° / 11°14810.2012.85.2
May21° / 15°16910.1013.76.3
Jun24° / 20°26414.3014.25.9
Jul27° / 24°25914.70145.5
Aug29° / 25°14712.7013.35.2
Sep26° / 22°16911.5012.26.4
Oct22° / 16°1137.7011.17.1
Nov16° / 11°788.1010.25.5
Dec11° / 699.80.39.82.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34852
44852
54852
64654
74654
84555
94555
104555
114555
124555
134456
144456
154456
164456
174456
184456
194456
204357
214357
224357
234357
244258
254258
264258
274159
284060
293961
303961
313862

Chance of precipitation in May

Any precipitation

Shūnan gets around 169 mm of rain over 10.1 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
432
532
633
733
833
933
1033
1133
1233
1333
1433
1533
1633
1732
1832
1932
2032
2132
2232
2332
2432
2532
2632
2732
2832
2933
3033
3134

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 (%)
1652681
2642781
3622891
4612991
55930101
65831101
75532112
85532112
95333122
105234122
115035132
124836132
134737142
144539142
154340152
164141162
173942172
183743182
193544202
203344212
213144232
222944243
232744263
242643283
252443303
262242324
272141354
281939375
291737396
301635417
311433448

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312calm
2412calm
2512calm
2612calm
2712calm
2811calm
2911calm
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 5:30 AM to 5:08 AM, and sunset from 6:50 PM to 7:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:306:50
213.45:296:51
313.45:276:52
413.45:266:53
513.55:256:53
613.55:246:54
713.55:246:55
813.65:236:56
913.65:226:57
1013.65:216:57
1113.65:206:58
1213.75:196:59
1313.75:187:00
1413.75:177:00
1513.75:177:01
1613.85:167:02
1713.85:157:03
1813.85:147:03
1913.85:147:04
2013.95:137:05
2113.95:137:06
2213.95:127:06
2313.95:117:07
2414.05:117:08
2514.05:107:09
2614.05:107:09
2714.05:097:10
2814.05:097:11
2914.05:087:11
3014.15:087:12
3114.15:087:13

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 2.29 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
15.5Bright
25.5Bright
35.5Bright
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
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Shūnan

In seasonPeak

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

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

Shūnan's rainy season runs March–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 Shūnan?

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

6.3
Sightseeing
3rd-best month of the year
3.6
Beach & pool
6th-best month of the year

May is a reasonable time to visit Shūnan for sightseeing.

What to pack for Shūnan in May

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

In May, Shūnan sees daytime highs around 21°C and nights near 15°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Shūnan in May

The nearest coast averages about 17°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 23 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 9 to Nov 16 — about 5.3 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Shūnan 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 Shūnan peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highModerateJun 23UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Shūnan 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 Shūnan is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateApr 1323 µg/m³Oct 1612 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar23Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct11Good
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Shūnan?

Shūnan sits at 34.1°N, 131.8°E, 316 m above sea level, in Japan. The nearest listed city is Tokuyama, 3.0 km away.

Topography around Shūnan

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

Within 3 km, the terrain around Shūnan has significant variations in elevation — a maximum elevation change of 556 m around an average of 247 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 785 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,367 m.

The land around Shūnan is covered by trees (85%) within 3 km, trees (68%) and water (21%) within 16 km, and water (49%) and trees (45%) within 80 km.

3 km
556 m
16 km
785 m
80 km
1,367 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Tokuyama 3.0 km · Kudamatsu 9.0 km · Hikari 18 km · Hōfu 24 km · Yanai 30 km · Yamaguchi 35 km · Iwakuni 37 km · Ōtake 39 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 Shūnan (34.0805°, 131.8256°, elevation 316 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).