Yōkaichiba weather in August

In August, Yōkaichiba sees average daytime highs of 29°C and overnight lows near 24°C, with 101 mm of rain across 11.1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 9th-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 27% 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 Yōkaichiba's 8th-clearest and 11th-windiest month. For the whole year in context, see Yōkaichiba's year-round climate.

Daytime high
29°
1st warmest
Overnight low
24°
12th coldest
Rainfall
101 mm
11.1 wet days
Daylight
13 h 24 min
5:01 AM – 6:23 PM
Cloud cover
63%
8th clearest
Wind
13 km/h
11th windiest
Solar energy
5.34 kWh/m²
Travel score
5.1
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 Yōkaichiba 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 26°C and 33°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)
13024
23024
33024
43024
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153024
163024
173024
183024
192924
202924
212924
222924
232924
242924
252924
262924
272924
282924
292924
302924
312924

How August really feels in Yōkaichiba

Once humidity and wind are folded in, August averages 27 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
27
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.

Yōkaichiba weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 828.70.79.92.1
Feb10° / 7790.810.62.3
Mar13° / 13013.10.511.73.4
Apr17° / 11°11212.6012.95.2
May21° / 16°12811.7013.96.1
Jun24° / 19°15913.2014.45.9
Jul28° / 23°14213.3014.25.4
Aug29° / 24°10111.1013.35.1
Sep26° / 22°16814012.25.8
Oct21° / 17°20913.2011.16.1
Nov17° / 11°10910.9010.15.2
Dec12° / 779.409.63.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34159
44258
54357
64258
74258
84258
94258
104258
114159
124159
134159
144159
154258
164258
174258
184357
194258
204258
214357
224456
234456
244456
254555
264456
274357
284357
294456
304456
314258

Chance of precipitation in August

Any precipitation

Yōkaichiba gets around 101 mm of rain over 11.1 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 36% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
132
232
332
432
532
632
733
833
933
1034
1134
1234
1335
1435
1536
1636
1736
1837
1937
2037
2138
2238
2339
2439
2540
2640
2741
2841
2942
3043
3143

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 52% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
104105630
204105531
304105432
404105333
504105333
604105234
704105234
804115134
904115035
1004115035
1104125035
1203125134
1303125134
1403135034
1513135033
1613135033
1713145032
1814145031
1914145130
2014155030
2114155228
2214165227
2314165326
2414175325
2514185324
2614185522
2714195521
2815205420
2915215419
3015225418
3115235417

Wind in August

Winds average 13 km/h in August.

Across August, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light 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
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light 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 4:49 AM to 5:13 AM, and sunset from 6:39 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:496:39
213.84:506:38
313.84:516:37
413.74:516:36
513.74:526:35
613.74:536:34
713.74:546:33
813.64:556:32
913.64:556:31
1013.64:566:30
1113.54:576:29
1213.54:586:27
1313.54:596:26
1413.44:596:25
1513.45:006:24
1613.45:016:23
1713.35:026:22
1813.35:036:20
1913.35:036:19
2013.25:046:18
2113.25:056:16
2213.25:066:15
2313.15:076:14
2413.15:076:12
2513.05:086:11
2613.05:096:10
2713.05:106:08
2812.95:116:07
2912.95:116:06
3012.95:126:04
3112.85:136:03

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.34 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.44 kWh/m² in May across the year — August's 5.34 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Yōkaichiba

In seasonPeak

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

Yōkaichiba 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 Yōkaichiba?

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

5.1
Sightseeing
8th-best month of the year
6.6
Beach & pool
1st-best month of the year

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

What to pack for Yōkaichiba in August

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

In August, Yōkaichiba sees daytime highs around 29°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Yōkaichiba in August

The nearest coast averages about 25°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore 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 Yōkaichiba in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yōkaichiba 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 Yōkaichiba 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 Yōkaichiba is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Yōkaichiba?

Yōkaichiba sits at 35.7°N, 140.6°E, 10 m above sea level, in Japan. The nearest listed city is Sōsa, 2.0 km away.

Topography around Yōkaichiba

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

Within 3 km, the terrain around Yōkaichiba has only modest variations in elevation — a maximum elevation change of 53 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 72 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.

The land around Yōkaichiba is covered by trees (39%), cropland (37%) and artificial surfaces (20%) within 3 km, cropland (31%), trees (30%) and water (22%) within 16 km, and water (42%) and trees (24%) within 80 km.

3 km
53 m
16 km
72 m
80 km
840 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Sōsa 2.0 km · Yokoshiba 8.0 km · Asahi 9.0 km · Sanmu 14 km · Narutō 16 km · Ryōgoku 17 km · Omigawa 18 km · Sawara 21 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 Yōkaichiba (35.7°, 140.55°, 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).