Hanyū weather in August

In August, Hanyū sees average daytime highs of 30°C and overnight lows near 23°C, with 171 mm of rain across 16.4 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 31°C in the first days to 29°C by the end. The sky is clear or mostly clear about 18% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 54 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Hanyū's 9th-clearest and 11th-windiest month. For the whole year in context, see Hanyū's year-round climate.

Daytime high
30°
1st warmest
Overnight low
23°
12th coldest
Rainfall
171 mm
16.4 wet days
Daylight
13 h 24 min
5:04 AM – 6:28 PM
Cloud cover
69%
9th clearest
Wind
5 km/h
11th windiest
Solar energy
4.4 kWh/m²
Travel score
4.1
out of 10

Hanyū is city in Saitama Prefecture, Japan.

Density
1,001/km²
people per km²
Founded
1954

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 31°C in the first days to 29°C by the end.

A typical August day in Hanyū reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 34°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143024
153024
163024
173023
183023
193023
203023
213023
223023
233023
243023
253023
262923
272923
282923
292923
302922
312922

How August really feels in Hanyū

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.

Hanyū 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 / -0°556.129.81.6
Feb / 536.92.310.62.0
Mar13° / 10411.81.511.73.5
Apr18° / 12112.20.212.95.4
May23° / 14°15313.7013.96.1
Jun25° / 18°18716.7014.45.3
Jul29° / 22°22018.8014.24.3
Aug30° / 23°17116.4013.44.1
Sep26° / 20°22116.7012.25.3
Oct21° / 14°20613.7011.15.9
Nov15° / 838.6010.15.0
Dec10° / 516.70.49.62.8

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23565
33664
43664
53664
63763
73763
83763
93862
103664
113664
123664
133664
143664
153565
163565
173565
183565
193565
203565
213565
223565
233565
243664
253664
263565
273664
283664
293664
303664
313664

Chance of precipitation in August

Any precipitation

Hanyū gets around 171 mm of rain over 16.4 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 53% and peaks near 57% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
151
251
351
451
551
651
751
851
952
1052
1153
1253
1353
1453
1553
1654
1754
1854
1954
2054
2154
2254
2355
2455
2555
2655
2755
2856
2956
3057
3157

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
105135923
205135824
305135824
405135824
505135824
605135824
705145724
805145724
905145823
1005145823
1106155623
1216155622
1316165621
1416165621
1516175620
1616185619
1716185619
1816195618
1916205617
2017215516
2117225515
2217245414
2317255413
2417265412
2518275311
2618295210
271830529
281931518
291933498
3011034497
3111035486

Wind in August

Winds average 5 km/h in August.

Across August, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 54 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 66 minutes over August. Sunrise moves from 4:52 AM to 5:17 AM, and sunset from 6:44 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:526:44
213.84:536:43
313.84:546:42
413.84:556:41
513.74:556:40
613.74:566:39
713.74:576:38
813.64:586:37
913.64:596:36
1013.64:596:35
1113.65:006:33
1213.55:016:32
1313.55:026:31
1413.55:036:30
1513.45:046:29
1613.45:046:28
1713.45:056:26
1813.35:066:25
1913.35:076:24
2013.25:086:22
2113.25:086:21
2213.25:096:20
2313.15:106:18
2413.15:116:17
2513.15:126:16
2613.05:136:14
2713.05:136:13
2813.05:146:12
2912.95:156:10
3012.95:166:09
3112.85:176:07

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.4 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 5.08 kWh/m² in May across the year — August's 4.4 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Moderate
304.0Moderate
313.9Moderate
Planning a trip in August

Hazard calendar for Hanyū

In seasonPeak

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

Hanyū's rainy season runs March–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Hanyū?

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

4.1
Sightseeing
8th-best month of the year
5.7
Beach & pool
1st-best month of the year

August is a reasonable time to visit Hanyū for sightseeing.

What to pack for Hanyū in August

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

In August, Hanyū sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 16 days see rain.

light clothesrain gear

Sea temperature near Hanyū 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 68 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 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Hanyū 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 Hanyū peaks around July 16 at about 10 (very high) — 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 highModerateJul 16UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Hanyū 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 Hanyū is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Hanyū?

Hanyū sits at 36.2°N, 139.5°E, 18 m above sea level, in Japan. The nearest listed city is Ōwa, 5.0 km away.

Topography around Hanyū

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

Within 3 km, the terrain around Hanyū has only modest variations in elevation — a maximum elevation change of 24 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 92 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,552 m.

The land around Hanyū is covered by artificial surfaces (48%) and cropland (40%) within 3 km, cropland (46%) and artificial surfaces (39%) within 16 km, and trees (51%) and artificial surfaces (26%) within 80 km.

3 km
24 m
16 km
92 m
80 km
2,552 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Ōwa 5.0 km · Gyōda 7.0 km · Kazo 8.0 km · Kisai 9.0 km · Tatebayashi 9.0 km · Fukiage-fujimi 11 km · Kōnosu 11 km · Shōbu 13 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 Hanyū (36.1667°, 139.5333°, elevation 18 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. 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).