Okayama weather in August

In August, Okayama sees average daytime highs of 33°C and overnight lows near 25°C, with 108 mm of rain across 10.3 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 33°C through the month. The sky is clear or mostly clear about 31% 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 Okayama's 5th-clearest and 10th-windiest month. For the whole year in context, see Okayama's year-round climate.

Daytime high
33°
1st warmest
Overnight low
25°
12th coldest
Rainfall
108 mm
10.3 wet days
Daylight
13 h 18 min
5:29 AM – 6:48 PM
Cloud cover
59%
5th clearest
Wind
9 km/h
10th windiest
Solar energy
5.45 kWh/m²
Travel score
3.6
out of 10
Air quality
Moderate
PM2.5 11 µg/m³ · 2010

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical August day in Okayama reaches about 33°C in the afternoon and slips back to 25°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 36°C. Set against its neighbours, August runs about 2°C warmer than July and about 4°C warmer than September.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13325
23325
33325
43326
53326
63326
73326
83326
93326
103326
113325
123325
133325
143325
153325
163325
173325
183325
193325
203325
213325
223225
233225
243225
253224
263224
273224
283224
293224
303224
313124

How August really feels in Okayama

Once humidity and wind are folded in, August averages 31 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
31
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.

Okayama 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
Jan10° / 405.50.39.92.4
Feb11° / 486.40.610.72.8
Mar14° / 929.30.111.74.3
Apr20° / 10°1089.7012.86.2
May24° / 15°1259.9013.86.8
Jun27° / 20°17212.2014.35.8
Jul31° / 24°18713.6014.14.0
Aug33° / 25°10810.3013.33.6
Sep29° / 21°16810.8012.25.5
Oct23° / 14°1147.7011.17.2
Nov18° / 576.1010.26.2
Dec12° / 465.30.19.73.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34852
44852
54852
64852
74852
84852
94852
104852
114753
124654
134654
144654
154654
164753
174852
184852
194852
204852
214852
224852
234852
244951
254852
264852
274951
284852
294852
304951
314852

Chance of precipitation in August

Any precipitation

Okayama gets around 108 mm of rain over 10.3 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
233
333
433
533
633
733
833
933
1033
1134
1234
1334
1435
1535
1635
1735
1835
1935
2034
2134
2234
2335
2435
2535
2635
2735
2835
2936
3036
3136

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 54% of days. Sticky, muggy-or-worse air turns up on roughly 94% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101135630
201135630
301135729
401135729
501145629
601145728
701155727
801155727
901165726
1001165726
1101175725
1202175625
1302185624
1412185524
1512195424
1613195423
1713205422
1814205322
1914215321
2015215320
2126215219
2227215218
2327225217
2428225216
2529225215
26310225114
27311225113
28312225112
29313235110
3041323519
3141424498

Wind in August

Winds average 9 km/h in August.

Across August, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
208calm
218calm
228calm
238calm
248calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

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 5:18 AM to 5:40 AM, and sunset from 7:03 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:187:03
213.75:187:02
313.75:197:01
413.75:207:00
513.65:216:59
613.65:216:58
713.65:226:57
813.65:236:56
913.55:246:55
1013.55:256:54
1113.55:256:53
1213.45:266:52
1313.45:276:51
1413.45:286:50
1513.35:286:49
1613.35:296:48
1713.35:306:46
1813.25:316:45
1913.25:316:44
2013.25:326:43
2113.15:336:42
2213.15:346:40
2313.15:346:39
2413.05:356:38
2513.05:366:36
2613.05:376:35
2712.95:376:34
2812.95:386:32
2912.95:396:31
3012.85:406:30
3112.85:406:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.45 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 5.74 kWh/m² in May across the year — August's 5.45 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.4Bright
175.4Bright
185.4Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in August

Hazard calendar for Okayama

In seasonPeak

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

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

Okayama'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 Okayama?

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

3.6
Sightseeing
10th-best month of the year
6.2
Beach & pool
2nd-best month of the year

August is a weaker month for outdoor sightseeing in Okayama. The water and warmth also suit a beach or pool day.

What to pack for Okayama in August

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

In August, Okayama sees daytime highs around 33°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 Okayama 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 41 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 Okayama 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 Okayama 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 Okayama 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 Okayama is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 8 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Okayama's WHO annual average of 11 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1415 µg/m³Oct 168 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar14Moderate
Apr15Moderate
May14Moderate
Jun12Moderate
Jul10Good
Aug10Good
Sep9Good
Oct8Good
Nov9Good
Dec9Good
Location & terrain

Where is Okayama?

Okayama sits at 34.6°N, 133.9°E, 5 m above sea level, in Japan. The nearest listed city is Tamano, 15 km away.

Topography around Okayama

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

Within 3 km, the terrain around Okayama has only modest variations in elevation — a maximum elevation change of 171 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 503 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,811 m.

The land around Okayama is covered by artificial surfaces (79%) within 3 km, trees (41%) and artificial surfaces (26%) within 16 km, and trees (61%) and water (26%) within 80 km.

3 km
171 m
16 km
503 m
80 km
1,811 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Tamano 15 km · Sōja 17 km · Kurashiki 17 km · Setouchi 19 km · Akaiwa 20 km · Naoshima 22 km · Bizen 32 km · Takahashi 33 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 Okayama (34.65°, 133.9333°, elevation 5 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).