Ishii weather in August

In August, Ishii sees average daytime highs of 29°C and overnight lows near 24°C, with 204 mm of rain across 16 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 29°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 Ishii's 8th-clearest and 10th-windiest month. For the whole year in context, see Ishii's year-round climate.

Daytime high
29°
1st warmest
Overnight low
24°
12th coldest
Rainfall
204 mm
16 wet days
Daylight
13 h 18 min
5:28 AM – 6:45 PM
Cloud cover
60%
8th clearest
Wind
10 km/h
10th windiest
Solar energy
5.25 kWh/m²
Travel score
4.8
out of 10

Ishii is town in Myōzai district, Tokushima prefecture, Japan.

Density
869/km²
people per km²
Founded
1907

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 29°C through the month.

A typical August day in Ishii reaches about 29°C in the afternoon and slips back to 24°C overnight — a 5°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 1°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
172924
182924
192924
202924
212924
222924
232924
242924
252924
262824
272824
282824
292824
302824
312823

How August really feels in Ishii

Once humidity and wind are folded in, August averages 20 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
20
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.

Ishii 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 / 717.31.1101.9
Feb10° / 798.41.310.72.2
Mar13° / 12811.60.211.73.5
Apr17° / 11°15111.3012.85.3
May21° / 15°19112.9013.76.0
Jun24° / 19°27716.8014.25.4
Jul28° / 23°26117.80144.9
Aug29° / 24°20416013.34.8
Sep26° / 21°28615.5012.25.8
Oct21° / 16°23111.7011.16.4
Nov16° / 11°1058.2010.25.4
Dec11° / 8170.19.83.2

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 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34951
44951
54951
64951
74951
84951
94852
104852
114852
124852
134852
144852
154753
164753
174753
184753
194852
204852
214753
224753
234753
244753
254654
264555
274555
284555
294555
304555
314654

Chance of precipitation in August

Any precipitation

Ishii gets around 204 mm of rain over 16 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 52% and peaks near 55% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
151
250
350
449
549
649
749
849
949
1049
1149
1249
1350
1450
1551
1651
1752
1852
1953
2053
2153
2254
2354
2454
2555
2655
2755
2855
2955
3055
3155

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 71% 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 (%)
10168013
20168013
30167914
40167914
50167815
60177715
70177616
80177616
90187516
100187516
110197317
120197317
1301107217
1401117117
1511117116
1611127016
1712126916
1812136915
1912146914
2012156814
2113166713
2213166812
2314176711
2414186710
251518679
261619668
271620667
281721656
291822636
301823635
311924624

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3111calm

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 5:17 AM to 5:39 AM, and sunset from 7:00 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:177:00
213.75:186:59
313.75:186:58
413.65:196:57
513.65:206:56
613.65:206:55
713.65:216:54
813.55:226:53
913.55:236:52
1013.55:236:51
1113.45:246:50
1213.45:256:49
1313.45:266:48
1413.35:266:47
1513.35:276:46
1613.35:286:45
1713.25:296:44
1813.25:296:42
1913.25:306:41
2013.25:316:40
2113.15:326:39
2213.15:326:38
2313.15:336:36
2413.05:346:35
2513.05:356:34
2613.05:356:32
2712.95:366:31
2812.95:376:30
2912.85:376:28
3012.85:386:27
3112.85:396:26

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.25 kWh/m².

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 5.5 kWh/m² in May across the year — August's 5.25 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
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.1Bright
235.0Bright
245.0Bright
255.0Bright
264.9Bright
274.9Bright
284.8Bright
294.8Bright
304.8Bright
314.7Bright
Planning a trip in August

Hazard calendar for Ishii

In seasonPeak

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

Ishii 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 Ishii?

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

4.8
Sightseeing
8th-best month of the year
6.0
Beach & pool
1st-best month of the year

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

What to pack for Ishii in August

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

In August, Ishii sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.

light clothesrain gearsun protection

Sea temperature near Ishii 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 18 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 5 to Nov 19 — about 5.5 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov20Refreshing
Dec17Cool

UV index in Ishii 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 Ishii peaks around July 11 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 11UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Ishii 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 Ishii is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (September, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1320 µg/m³Sep 2010 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec11Good
Location & terrain

Where is Ishii?

Ishii sits at 34.1°N, 134.4°E, 10 m above sea level, in Japan. The nearest listed city is Kamojimachō-jōgejima, 8.0 km away.

Topography around Ishii

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

Within 3 km, the terrain around Ishii has only modest variations in elevation — a maximum elevation change of 208 m around an average of 34 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,024 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,941 m.

The land around Ishii is covered by artificial surfaces (34%), trees (31%) and cropland (29%) within 3 km, trees (60%) within 16 km, and water (49%) and trees (42%) within 80 km.

3 km
208 m
16 km
1,024 m
80 km
1,941 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Kamojimachō-jōgejima 8.0 km · Yakami 10 km · Takabō 11 km · Tokushima 11 km · Yoshinogawa 14 km · Awa 15 km · Komatsushimachō 15 km · Higashikagawa 19 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 Ishii (34.0675°, 134.4421°, elevation 10 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).