Hikari weather in May

In May, Hikari sees average daytime highs of 20°C and overnight lows near 16°C, with 167 mm of rain across 10 wet days and about 13.7 hours of daylight. It is the 6th-warmest and 4th-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 32% 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 h 06 min by month's end. Set against the rest of the year, May is Hikari's 10th-clearest and 9th-windiest month. For the whole year in context, see Hikari's year-round climate.

Daytime high
20°
6th warmest
Overnight low
16°
7th coldest
Rainfall
167 mm
10 wet days
Daylight
13 h 48 min
5:16 AM – 7:01 PM
Cloud cover
61%
10th clearest
Wind
12 km/h
9th windiest
Solar energy
5.51 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 Hikari reaches about 20°C in the afternoon and slips back to 16°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 22°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)
11914
21914
31914
41914
51915
61915
71915
82015
92015
102015
112015
122016
132016
142016
152016
162016
172116
182116
192116
202117
212117
222117
232117
242117
252117
262117
272217
282218
292218
302218
312218

How May really feels in Hikari

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.

Hikari weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 588.10.8101.9
Feb10° / 748.80.810.72.1
Mar12° / 1229.90.111.73.4
Apr16° / 12°1469.9012.85.2
May20° / 16°16710013.76.3
Jun23° / 20°25313.5014.26.0
Jul27° / 24°23913.80145.6
Aug29° / 25°14311.5013.35.5
Sep26° / 22°16911.2012.26.5
Oct22° / 17°1207.7011.17.1
Nov17° / 12°767.8010.25.7
Dec12° / 6890.29.83.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% 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 (%)
15050
25050
35050
44951
54852
64852
74753
84753
94654
104654
114456
124456
134555
144555
154555
164456
174456
184555
194555
204456
214456
224456
234357
244357
254258
264258
274258
284060
293961
303961
313862

Chance of precipitation in May

Any precipitation

Hikari gets around 167 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 32% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
331
431
532
632
732
832
933
1033
1133
1233
1333
1433
1533
1633
1732
1832
1932
2032
2132
2232
2332
2432
2532
2632
2732
2832
2932
3032
3133

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

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1573391
2563491
35435101
45236111
55037121
64838121
74639131
84540142
94340152
104241162
114042162
123843172
133644182
143444192
153345202
163146222
172846233
182646253
192546263
202346283
212145304
221945324
231844345
241643365
251542386
261340407
271239428
281037449
299354610
308334712
317314814

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.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
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 5:29 AM to 5:07 AM, and sunset from 6:50 PM to 7:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:296:50
213.45:286:50
313.45:276:51
413.45:266:52
513.55:256:53
613.55:246:53
713.55:236:54
813.55:226:55
913.65:216:56
1013.65:216:57
1113.65:206:57
1213.75:196:58
1313.75:186:59
1413.75:177:00
1513.75:167:00
1613.85:167:01
1713.85:157:02
1813.85:147:03
1913.85:147:03
2013.95:137:04
2113.95:127:05
2213.95:127:06
2313.95:117:06
2413.95:117:07
2514.05:107:08
2614.05:107:08
2714.05:097:09
2814.05:097:10
2914.05:087:10
3014.15:087:11
3114.15:077:12

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.51 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 5.51 kWh/m² in May across the year — May's 5.51 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
175.5Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.4Bright
Planning a trip in May

Hazard calendar for Hikari

In seasonPeak

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

Hikari 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 Hikari?

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
3.5
Beach & pool
6th-best month of the year

May is a reasonable time to visit Hikari for sightseeing.

What to pack for Hikari in May

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

In May, Hikari sees daytime highs around 20°C and nights near 16°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Hikari 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 offshore 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 Hikari 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 Hikari 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 Hikari 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 Hikari 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 Hikari?

Hikari sits at 34.0°N, 131.9°E, 1 m above sea level, in Japan. The nearest listed city is Kudamatsu, 10 km away.

Topography around Hikari

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

Within 3 km, the terrain around Hikari has significant variations in elevation — a maximum elevation change of 298 m around an average of 45 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 693 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,334 m.

The land around Hikari is covered by trees (40%), water (35%) and artificial surfaces (22%) within 3 km, water (46%) and trees (43%) within 16 km, and water (49%) and trees (45%) within 80 km.

3 km
298 m
16 km
693 m
80 km
1,334 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Kudamatsu 10 km · Yanai 15 km · Tokuyama 16 km · Shūnan 18 km · Iwakuni 34 km · Hōfu 37 km · Ōtake 38 km · Ōno-hara 47 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 Hikari (33.955°, 131.95°, elevation 1 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).