Kashiwazaki weather in May

In May, Kashiwazaki sees average daytime highs of 22°C and overnight lows near 12°C, with 104 mm of rain across 12.9 wet days and about 14 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 20°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 dry.

Daylight stretches from about 13 h 30 min at the start of May to 14 h 24 min by month's end. Set against the rest of the year, May is Kashiwazaki's 3rd-clearest and 7th-windiest month. For the whole year in context, see Kashiwazaki's year-round climate.

Daytime high
22°
5th warmest
Overnight low
12°
8th coldest
Rainfall
104 mm
12.9 wet days
Daylight
14 hours
4:42 AM – 6:42 PM
Cloud cover
63%
3rd clearest
Wind
8 km/h
7th windiest
Solar energy
5.75 kWh/m²
Travel score
6.2
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 24°C by the end.

A typical May day in Kashiwazaki reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°C. Set against its neighbours, May runs about 6°C warmer than April and about 4°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12010
22010
32010
42010
52010
62111
72111
82111
92111
102111
112112
122112
132112
142212
152212
162212
172212
182213
192213
202213
212313
222313
232313
242314
252314
262314
272314
282414
292414
302415
312415

How May really feels in Kashiwazaki

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.

Kashiwazaki weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°21525.618.99.70.0
Feb / -1°15621.115.710.60.2
Mar10° / 143208.811.71.7
Apr16° / 10414.50.812.94.6
May22° / 12°10412.90146.2
Jun25° / 17°12613.5014.55.9
Jul29° / 22°21216.9014.34.5
Aug31° / 23°14514.5013.44.2
Sep26° / 19°16314.9012.35.6
Oct20° / 12°16015.40115.6
Nov14° / 15918.20.7103.3
Dec / 20823.710.59.50.9

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 (%)
14357
24258
34258
44258
54159
64159
74159
84258
94159
104159
114159
124159
134159
144159
154159
164159
174159
184159
194060
204060
214159
224258
234258
244159
254159
264159
274258
284159
294159
304060
314060

Chance of precipitation in May

Any precipitation

Kashiwazaki gets around 104 mm of rain over 12.9 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 41% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
341
441
541
642
742
842
942
1043
1143
1243
1344
1444
1544
1644
1744
1843
1943
2042
2142
2241
2340
2440
2539
2638
2737
2837
2936
3036
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 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
190910
2881110
3871210
4861310
5841420
6831520
7821620
8811720
9801820
10791920
11772030
12762130
13752230
14752230
15732340
16722440
17722440
18702550
19682561
20672661
21652771
22632881
23622981
24593191
25583291
265534101
275335111
285037121
294739131
304440151
314142161

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 4:57 AM to 4:32 AM, and sunset from 6:29 PM to 6:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:576:29
213.64:566:29
313.64:556:30
413.64:546:31
513.74:536:32
613.74:526:33
713.74:516:34
813.84:506:35
913.84:496:36
1013.84:486:37
1113.94:476:38
1213.94:466:39
1313.94:456:39
1413.94:446:40
1514.04:436:41
1614.04:426:42
1714.04:416:43
1814.14:406:44
1914.14:406:45
2014.14:396:45
2114.14:386:46
2214.24:376:47
2314.24:376:48
2414.24:366:49
2514.24:366:50
2614.34:356:50
2714.34:346:51
2814.34:346:52
2914.34:336:53
3014.34:336:53
3114.44:326:54

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.75 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.89 kWh/m² to a high of 5.75 kWh/m² in May across the year — May's 5.75 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in May

Hazard calendar for Kashiwazaki

In seasonPeak

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

Kashiwazaki 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 Kashiwazaki?

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

6.2
Sightseeing
1st-best month of the year
4.2
Beach & pool
5th-best month of the year

May is a reasonable time to visit Kashiwazaki for sightseeing.

What to pack for Kashiwazaki in May

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

In May, Kashiwazaki sees daytime highs around 22°C and nights near 12°C. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Kashiwazaki in May

The nearest coast averages about 15°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 March near 10°C.

It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Kashiwazaki in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kashiwazaki peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 12UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug10Very high
Sep9Very high
Oct5High
Nov3Moderate
Dec2Moderate

Air quality in Kashiwazaki 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 Kashiwazaki is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1723 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug14Moderate
Sep12Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Kashiwazaki?

Kashiwazaki sits at 37.4°N, 138.6°E, 4 m above sea level, in Japan. The nearest listed city is Ojiya, 23 km away.

Topography around Kashiwazaki

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

Within 3 km, the terrain around Kashiwazaki has only modest variations in elevation — a maximum elevation change of 148 m around an average of 14 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 974 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,405 m.

The land around Kashiwazaki is covered by artificial surfaces (36%) and water (33%) within 3 km, trees (48%) and water (40%) within 16 km, and trees (52%) and water (36%) within 80 km.

3 km
148 m
16 km
974 m
80 km
2,405 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Ojiya 23 km · Nagaoka 28 km · Tōkamachi 32 km · Jōetsu 37 km · Mitsuke 39 km · Uonuma 39 km · Tochio-honchō 41 km · Minamiuonuma 43 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 Kashiwazaki (37.3667°, 138.55°, elevation 4 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).