Miyajima weather in August

In August, Miyajima sees average daytime highs of 30°C and overnight lows near 24°C, with 156 mm of rain across 14.1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 30% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Miyajima's 9th-clearest and 11th-windiest month. For the whole year in context, see Miyajima's year-round climate.

Daytime high
30°
1st warmest
Overnight low
24°
12th coldest
Rainfall
156 mm
14.1 wet days
Daylight
13 h 18 min
5:36 AM – 6:54 PM
Cloud cover
61%
9th clearest
Wind
8 km/h
11th windiest
Solar energy
5.19 kWh/m²
Travel score
4.4
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical August day in Miyajima reaches about 30°C in the afternoon and slips back to 24°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 33°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173025
183024
193024
203024
213024
223024
233024
243024
253024
263024
273024
282923
292923
302923
312923

How August really feels in Miyajima

Once humidity and wind are folded in, August averages 29 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
29
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Miyajima weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 506.11101.8
Feb10° / 667.91.510.72.2
Mar13° / 1139.90.411.73.7
Apr18° / 10°1399.9012.85.7
May22° / 15°16110.1013.86.6
Jun25° / 19°22713.7014.25.9
Jul29° / 23°24915.1014.14.8
Aug30° / 24°15614.1013.34.4
Sep27° / 21°18711.7012.26.1
Oct22° / 15°1208.3011.17.1
Nov16° / 727.1010.25.6
Dec11° / 586.50.39.83.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
24951
34951
45050
55050
65050
74951
84951
94852
104852
114852
124753
134753
144753
154753
164654
174654
184753
194654
204654
214555
224555
234555
244456
254456
264456
274258
284357
294357
304357
314357

Chance of precipitation in August

Any precipitation

Miyajima gets around 156 mm of rain over 14.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 45% and peaks near 48% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
142
242
342
442
542
643
743
843
943
1043
1144
1244
1345
1445
1546
1646
1747
1847
1947
2047
2147
2247
2348
2448
2548
2648
2748
2848
2948
3047
3147

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the oppressive band about 64% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10066925
20056926
30056827
40046927
50046828
60146728
70136828
80136828
90146728
100146728
110146728
120156628
130156727
140266626
151276426
161286425
171296424
1812106423
1912116422
2013136320
2113146319
2213156318
2313176316
2414186215
2514196214
2615216013
2715226111
2816245910
291725589
301727578
311828567

Wind in August

Winds average 8 km/h in August.

Across August, daily wind ranges from about 8 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
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 42 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over August. Sunrise moves from 5:25 AM to 5:47 AM, and sunset from 7:09 PM to 6:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:257:09
213.75:267:08
313.75:267:07
413.75:277:06
513.65:287:05
613.65:297:04
713.65:297:03
813.55:307:02
913.55:317:01
1013.55:327:00
1113.45:326:59
1213.45:336:58
1313.45:346:57
1413.45:356:56
1513.35:356:55
1613.35:366:54
1713.35:376:52
1813.25:386:51
1913.25:386:50
2013.25:396:49
2113.15:406:48
2213.15:416:46
2313.15:416:45
2413.05:426:44
2513.05:436:42
2613.05:436:41
2712.95:446:40
2812.95:456:38
2912.95:466:37
3012.85:466:36
3112.85:476:34

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.19 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.57 kWh/m² in May across the year — August's 5.19 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
244.9Bright
254.9Bright
264.9Bright
274.8Bright
284.8Bright
294.8Bright
304.7Bright
314.7Bright
Planning a trip in August

Hazard calendar for Miyajima

In seasonPeak

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

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

Miyajima's rainy season runs March–October, 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 August a good time to visit Miyajima?

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

4.4
Sightseeing
8th-best month of the year
6.2
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Miyajima for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Miyajima in August

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

In August, Miyajima sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 14 days see rain.

light clothesrain gearsun protection

Sea temperature near Miyajima in August

The nearest coast averages about 26°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 20 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 13 to Nov 17 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Miyajima in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Miyajima peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highVery highModerateJul 13UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Miyajima in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Miyajima is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1022 µg/m³Oct 1310 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr22Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Moderate
Sep11Good
Oct10Good
Nov12Moderate
Dec12Good
Location & terrain

Where is Miyajima?

Miyajima sits at 34.3°N, 132.3°E, 0 m above sea level, in Japan. The nearest listed city is Ōno-hara, 5.0 km away.

Topography around Miyajima

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

Within 3 km, the terrain around Miyajima has significant variations in elevation — a maximum elevation change of 510 m around an average of 72 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,032 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,327 m.

The land around Miyajima is covered by water (47%) and trees (43%) within 3 km, trees (46%) and water (40%) within 16 km, and trees (60%) and water (33%) within 80 km.

3 km
510 m
16 km
1,032 m
80 km
1,327 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Ōno-hara 5.0 km · Hatsukaichi 6.0 km · Ōtake 14 km · Etajima 16 km · Hiroshima 16 km · Iwakuni 18 km · Fuchū 20 km · Gion 20 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 Miyajima (34.2991°, 132.3219°, elevation 0 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).