Ōamishirasato weather in May

In May, Ōamishirasato sees average daytime highs of 21°C and overnight lows near 16°C, with 127 mm of rain across 11.2 wet days and about 13.8 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 23°C by the end. The sky is clear or mostly clear about 24% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 13 h 24 min at the start of May to 14 h 12 min by month's end. Set against the rest of the year, May is Ōamishirasato's 10th-clearest and 3rd-windiest month. For the whole year in context, see Ōamishirasato's year-round climate.

Daytime high
21°
5th warmest
Overnight low
16°
7th coldest
Rainfall
127 mm
11.2 wet days
Daylight
13 h 54 min
4:39 AM – 6:31 PM
Cloud cover
69%
10th clearest
Wind
13 km/h
3rd windiest
Solar energy
5.35 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 23°C by the end.

A typical May day in Ōamishirasato reaches about 21°C in the afternoon and slips back to 16°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 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12014
22014
32014
42014
52015
62015
72015
82115
92115
102115
112115
122115
132116
142116
152116
162116
172216
182216
192216
202216
212217
222217
232217
242217
252217
262317
272317
282317
292318
302318
312318

How May really feels in Ōamishirasato

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.

Ōamishirasato weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 838.10.69.92.2
Feb10° / 788.80.810.72.3
Mar13° / 13513.10.411.73.3
Apr17° / 11°11512.5012.95.1
May21° / 16°12711.2013.86.2
Jun24° / 20°16613.2014.45.9
Jul28° / 23°13512.6014.25.4
Aug30° / 25°10211.3013.35.0
Sep26° / 22°17514.3012.25.7
Oct21° / 17°21913.6011.16.0
Nov17° / 12°11211010.15.2
Dec12° / 758.509.63.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 11% of May, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24159
34159
44159
53961
63763
73763
83664
93565
103466
113466
123367
133367
143367
153466
163466
173466
183466
193466
203466
213466
223565
233466
243466
253466
263466
273367
283367
293367
303268
313268

Chance of precipitation in May

Any precipitation

Ōamishirasato gets around 127 mm of rain over 11.2 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 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
334
434
534
634
735
835
935
1035
1136
1236
1337
1437
1537
1638
1738
1837
1937
2037
2137
2237
2336
2436
2536
2636
2736
2836
2935
3036
3136

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 39% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1603181
2583291
35732101
45533111
55334121
65135131
74935141
84836152
94637162
104438162
114238172
124039183
133840193
143641203
153442213
163243223
173043234
182844244
192644254
202544275
212344285
222144305
232043316
241842336
251741357
261640367
271539388
281437409
2913364110
3012354211
3111334312

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 min at the start of May to 14 h 12 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 4:53 AM to 4:30 AM, and sunset from 6:18 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.44:536:18
213.54:526:19
313.54:516:20
413.54:506:21
513.54:496:22
613.64:486:23
713.64:476:23
813.64:466:24
913.74:456:25
1013.74:446:26
1113.74:436:27
1213.84:426:28
1313.84:416:28
1413.84:406:29
1513.84:406:30
1613.94:396:31
1713.94:386:32
1813.94:376:32
1913.94:376:33
2014.04:366:34
2114.04:356:35
2214.04:356:36
2314.04:346:36
2414.14:336:37
2514.14:336:38
2614.14:326:39
2714.14:326:39
2814.14:316:40
2914.24:316:41
3014.24:306:41
3114.24:306:42

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.35 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.35 kWh/m² in May across the year — May's 5.35 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in May

Hazard calendar for Ōamishirasato

In seasonPeak

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

Ōamishirasato 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 Ōamishirasato?

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
4.0
Beach & pool
5th-best month of the year

May is a reasonable time to visit Ōamishirasato for sightseeing.

What to pack for Ōamishirasato in May

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

In May, Ōamishirasato sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Ōamishirasato in May

The nearest coast averages about 19°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 28 km away) is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr16Cool
May19Cool
Jun21Refreshing
Jul23Refreshing
Aug25Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Ōamishirasato 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 Ōamishirasato peaks around August 12 at about 10 (extreme) — 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 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateAug 12UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Ōamishirasato 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 Ōamishirasato is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (September, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1322 µg/m³Sep 911 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul12Good
Aug11Good
Sep11Good
Oct14Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Ōamishirasato?

Ōamishirasato sits at 35.5°N, 140.4°E, 7 m above sea level, in Japan. The nearest listed city is Ōami, 3.0 km away.

Topography around Ōamishirasato

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

Within 3 km, the terrain around Ōamishirasato has only modest variations in elevation — a maximum elevation change of 20 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 186 m; within 80 km, significant variations in elevation — a maximum elevation change of 452 m.

The land around Ōamishirasato is covered by cropland (49%) and trees (28%) within 3 km, trees (35%), cropland (23%) and water (21%) within 16 km, and water (44%), trees (23%) and artificial surfaces (20%) within 80 km.

3 km
20 m
16 km
186 m
80 km
452 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Ōami 3.0 km · Tōgane 4.0 km · Mobara 11 km · Narutō 11 km · Sanmu 14 km · Yachimata 16 km · Yokoshiba 19 km · Yotsukaidō 23 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 Ōamishirasato (35.5118°, 140.3526°, elevation 7 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).