Setouchi weather in August

In August, Setouchi sees average daytime highs of 29°C and overnight lows near 25°C, with 109 mm of rain across 10.1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 35% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Setouchi's 5th-clearest and 10th-windiest month. For the whole year in context, see Setouchi's year-round climate.

Daytime high
29°
1st warmest
Overnight low
25°
12th coldest
Rainfall
109 mm
10.1 wet days
Daylight
13 h 18 min
5:28 AM – 6:47 PM
Cloud cover
57%
5th clearest
Wind
12 km/h
10th windiest
Solar energy
5.55 kWh/m²
Travel score
5.6
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical August day in Setouchi reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, August runs about 2°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262825
272825
282825
292824
302824
312824

How August really feels in Setouchi

Once humidity and wind are folded in, August averages 23 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
23
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.

Setouchi weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 476.50.49.91.9
Feb / 597.60.610.72.1
Mar12° / 10810.1011.73.3
Apr16° / 11°12710.4012.85.1
May20° / 15°14210.2013.86.3
Jun23° / 20°18512.2014.36.1
Jul27° / 24°19212.7014.15.9
Aug29° / 25°10910.1013.35.6
Sep26° / 22°18111.6012.26.4
Oct22° / 17°1338.5011.16.9
Nov16° / 11°687010.25.6
Dec11° / 576.50.19.73.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25347
35347
45347
55248
65248
75248
85248
95149
105149
115050
125050
135050
145050
154951
164951
174951
185050
195050
205050
215050
225050
235149
245149
255149
265149
275050
285050
295050
305050
315149

Chance of precipitation in August

Any precipitation

Setouchi gets around 109 mm of rain over 10.1 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 33% and peaks near 41% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
130
230
329
429
529
629
729
829
929
1030
1130
1231
1332
1432
1533
1633
1734
1834
1934
2035
2135
2236
2336
2436
2537
2638
2738
2839
2939
3040
3141

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 44% 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 (%)
10064747
20064648
30064648
40064548
50064549
60064549
70074449
80074449
90074449
100074349
110184348
120184348
130184347
140194347
150194346
1611104345
1712114344
1812114343
1912124342
2012134440
2113144439
2213154437
2313164536
2414174534
2514184532
2615194530
2715204629
2816214527
2917224525
3017234523
3118254522

Wind in August

Winds average 12 km/h in August.

Across August, daily wind ranges from about 12 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
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 48 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 60 minutes over August. Sunrise moves from 5:17 AM to 5:40 AM, and sunset from 7:02 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:177:02
213.75:187:01
313.75:187:00
413.75:196:59
513.65:206:59
613.65:216:58
713.65:216:57
813.65:226:56
913.55:236:55
1013.55:246:54
1113.55:246:52
1213.45:256:51
1313.45:266:50
1413.45:276:49
1513.35:276:48
1613.35:286:47
1713.35:296:46
1813.25:306:44
1913.25:316:43
2013.25:316:42
2113.15:326:41
2213.15:336:39
2313.15:346:38
2413.05:346:37
2513.05:356:36
2613.05:366:34
2712.95:376:33
2812.95:376:32
2912.95:386:30
3012.85:396:29
3112.85:406:27

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.55 kWh/m².

For context, solar energy here swings from a low near 2.42 kWh/m² to a high of 5.76 kWh/m² in May across the year — August's 5.55 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.2Bright
275.2Bright
285.1Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in August

Hazard calendar for Setouchi

In seasonPeak

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

Setouchi 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 August a good time to visit Setouchi?

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

5.6
Sightseeing
6th-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Setouchi in August

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

In August, Setouchi sees daytime highs around 29°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Setouchi in August

The nearest coast averages about 27°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 22 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 12 — about 5.2 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
Sep26Warm
Oct24Refreshing
Nov20Cool
Dec16Cool

UV index in Setouchi 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 Setouchi peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highModerateJul 13UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Setouchi 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 Setouchi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1422 µg/m³Oct 1613 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar21Moderate
Apr23Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug15Moderate
Sep13Moderate
Oct12Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Setouchi?

Setouchi sits at 34.7°N, 134.1°E, 8 m above sea level, in Japan. The nearest listed city is Bizen, 17 km away.

Topography around Setouchi

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

Within 3 km, the terrain around Setouchi has only modest variations in elevation — a maximum elevation change of 245 m around an average of 46 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 511 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,522 m.

The land around Setouchi is covered by trees (65%) within 3 km, water (41%) and trees (38%) within 16 km, and trees (59%) and water (26%) within 80 km.

3 km
245 m
16 km
511 m
80 km
1,522 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Bizen 17 km · Okayama 19 km · Akaiwa 20 km · Tamano 24 km · Kariya 25 km · Naoshima 26 km · Kamigōri 31 km · Aioi 34 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 Setouchi (34.6592°, 134.1424°, elevation 8 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).