Kamaishi weather in May

In May, Kamaishi sees average daytime highs of 16°C and overnight lows near 10°C, with 125 mm of rain across 12.3 wet days and about 14.1 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 18°C by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of May to 14 h 30 min by month's end. Set against the rest of the year, May is Kamaishi's 8th-clearest and 8th-windiest month. For the whole year in context, see Kamaishi's year-round climate.

Daytime high
16°
6th warmest
Overnight low
10°
7th coldest
Rainfall
125 mm
12.3 wet days
Daylight
14 h 06 min
4:24 AM – 6:33 PM
Cloud cover
68%
8th clearest
Wind
11 km/h
8th windiest
Solar energy
5.49 kWh/m²
Travel score
4.7
out of 10

Kamaishi is city in Iwate Prefecture, Japan.

Density
98/km²
people per km²
Founded
1937

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 15°C in the first days to 18°C by the end.

A typical May day in Kamaishi reaches about 16°C in the afternoon and slips back to 10°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°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)
1148
2148
3158
4158
5158
6158
7159
8159
9159
10159
11159
12169
13169
141610
151610
161610
171610
181610
191610
201710
211711
221711
231711
241711
251711
261711
271711
281712
291812
301812
311812

How May really feels in Kamaishi

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.

Kamaishi weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°577.85.99.60.0
Feb / -4°537.76.310.50.0
Mar / -1°10211.46.311.70.6
Apr12° / 10811.71.6132.9
May16° / 10°12512.3014.14.7
Jun19° / 14°13813014.75.4
Jul23° / 18°17116.2014.55.6
Aug25° / 20°17815.3013.55.8
Sep22° / 16°19815012.35.6
Oct17° / 10°15911.10115.1
Nov11° / 809.30.69.82.8
Dec / -0°689.349.30.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34258
44159
54060
63961
73961
83862
93862
103862
113664
123664
133664
143664
153664
163664
173763
183763
193763
203763
213763
223763
233763
243763
253763
263763
273862
283763
293664
303664
313565

Chance of precipitation in May

Any precipitation

Kamaishi gets around 125 mm of rain over 12.3 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 40% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
338
438
538
638
738
839
939
1039
1140
1240
1340
1441
1541
1641
1741
1841
1941
2041
2141
2241
2340
2440
2540
2640
2739
2839
2939
3039
3139

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 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79910
89820
99820
109820
119820
129730
139730
149730
159640
169640
179550
189460
199370
209280
219190
2290100
2388120
2487130
2585150
2683161
2781181
2880191
2978211
3076231
3173252

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 36 min at the start of May to 14 h 30 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 4:41 AM to 4:14 AM, and sunset from 6:19 PM to 6:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.64:416:19
213.74:406:20
313.74:386:21
413.74:376:22
513.84:366:23
613.84:356:24
713.84:346:25
813.94:336:25
913.94:316:26
1014.04:306:27
1114.04:296:28
1214.04:286:29
1314.14:276:30
1414.14:266:31
1514.14:256:32
1614.14:246:33
1714.24:246:34
1814.24:236:35
1914.24:226:36
2014.34:216:37
2114.34:206:38
2214.34:196:39
2314.34:196:39
2414.44:186:40
2514.44:176:41
2614.44:176:42
2714.44:166:43
2814.54:156:44
2914.54:156:44
3014.54:146:45
3114.54:146:46

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.49 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.12 kWh/m² to a high of 5.49 kWh/m² in May across the year — May's 5.49 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
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in May

Hazard calendar for Kamaishi

In seasonPeak

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

Kamaishi 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 Kamaishi?

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

4.7
Sightseeing
6th-best month of the year
0.7
Beach & pool
6th-best month of the year

May is a reasonable time to visit Kamaishi for sightseeing.

What to pack for Kamaishi in May

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

In May, Kamaishi sees daytime highs around 16°C and nights near 10°C. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near Kamaishi in May

The nearest coast averages about 12°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 17 km away) is warmest in August at about 22°C and coldest in March near 7°C.

It's comfortable for a long swim from Jul 26 to Oct 1 — about 2.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan10Bracing
Feb8Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun16Cool
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct19Cool
Nov16Cool
Dec13Bracing

UV index in Kamaishi 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 Kamaishi peaks around August 19 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 19UV 8Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul6High
Aug9Very high
Sep7Very high
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Kamaishi 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 Kamaishi is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1319 µg/m³Dec 179 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar18Moderate
Apr19Moderate
May17Moderate
Jun12Moderate
Jul11Good
Aug9Good
Sep10Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Kamaishi?

Kamaishi sits at 39.3°N, 141.9°E, 25 m above sea level, in Japan. The nearest listed city is Yamada, 22 km away.

Topography around Kamaishi

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

Within 3 km, the terrain around Kamaishi has significant variations in elevation — a maximum elevation change of 511 m around an average of 145 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,341 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,861 m.

The land around Kamaishi is covered by trees (81%) within 3 km, trees (63%) and water (33%) within 16 km, and trees (57%) and water (35%) within 80 km.

3 km
511 m
16 km
1,341 m
80 km
1,861 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Yamada 22 km · Ōfunato 26 km · Tōno 29 km · Rikuzen-Takata 34 km · Miyako 42 km · Kesennuma 49 km · Ōshū 62 km · Kitakami 65 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 Kamaishi (39.2769°, 141.868°, elevation 25 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).