Hannō weather in August

In August, Hannō sees average daytime highs of 28°C and overnight lows near 22°C, with 205 mm of rain across 21 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. 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 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 Hannō's 8th-clearest and 10th-windiest month. For the whole year in context, see Hannō's year-round climate.

Daytime high
28°
1st warmest
Overnight low
22°
12th coldest
Rainfall
205 mm
21 wet days
Daylight
13 h 24 min
5:06 AM – 6:28 PM
Cloud cover
69%
8th clearest
Wind
6 km/h
10th windiest
Solar energy
4.58 kWh/m²
Travel score
4.4
out of 10

Hannō is city in Saitama Prefecture, Japan.

Density
416/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

Day-to-day highs hold fairly steady near 28°C through the month.

A typical August day in Hannō reaches about 28°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°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)
12922
22922
32922
42922
52922
62922
72922
82922
92922
102922
112922
122922
132922
142922
152822
162822
172822
182822
192822
202822
212822
222822
232822
242822
252822
262821
272721
282721
292721
302721
312721

How August really feels in Hannō

Once humidity and wind are folded in, August averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hannō 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 / -2°778.54.49.81.0
Feb / -1°759.64.610.61.2
Mar11° / 13915.24.711.72.5
Apr16° / 14614.60.912.94.5
May21° / 13°16615.6013.95.5
Jun23° / 17°22219.5014.44.9
Jul27° / 21°24321.8014.24.5
Aug28° / 22°20521013.44.4
Sep25° / 18°24918.3012.25.2
Oct19° / 13°24216.2011.15.2
Nov14° / 10111.30.210.14.1
Dec10° / 688.31.49.62.2

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 16% of August, with mostly cloudy or overcast conditions the remaining 66%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23466
33466
43466
53565
63565
73565
83466
93466
103466
113367
123367
133367
143367
153367
163367
173367
183367
193466
203367
213367
223466
233565
243565
253565
263565
273565
283565
293565
303466
313466

Chance of precipitation in August

Any precipitation

Hannō gets around 205 mm of rain over 21 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 68% and peaks near 69% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
168
269
369
469
569
669
769
869
969
1068
1168
1268
1368
1468
1568
1668
1768
1868
1968
2067
2167
2267
2367
2466
2566
2666
2766
2866
2966
3066
3166

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 60% of days. Sticky, muggy-or-worse air turns up on roughly 90% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10623665
20622675
30522685
40521686
50521686
60521686
70520696
80620686
90620686
101620676
111620676
121621666
131621675
141622665
151722655
161723654
171724644
181825633
192826613
202827603
212928592
222930572
2321031552
2421032551
2521134521
2621135511
2721237481
2821338461
2921439440
3021540420
3131541400

Wind in August

Winds average 6 km/h in August.

Across August, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
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 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 4:54 AM to 5:18 AM, and sunset from 6:44 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:546:44
213.84:556:43
313.84:556:42
413.74:566:41
513.74:576:40
613.74:586:39
713.74:586:38
813.64:596:37
913.65:006:36
1013.65:016:35
1113.55:026:34
1213.55:036:33
1313.55:036:31
1413.45:046:30
1513.45:056:29
1613.45:066:28
1713.35:076:27
1813.35:076:25
1913.35:086:24
2013.25:096:23
2113.25:106:22
2213.25:116:20
2313.15:116:19
2413.15:126:18
2513.15:136:16
2613.05:146:15
2713.05:156:13
2812.95:156:12
2912.95:166:11
3012.95:176:09
3112.85:186:08

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.58 kWh/m².

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 5.06 kWh/m² in May across the year — August's 4.58 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
314.1Bright
Planning a trip in August

Hazard calendar for Hannō

In seasonPeak

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

Hannō 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 Hannō?

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

4.4
Sightseeing
7th-best month of the year
5.1
Beach & pool
1st-best month of the year

August is a reasonable time to visit Hannō for sightseeing.

What to pack for Hannō in August

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

In August, Hannō sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Hannō 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 56 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 Hannō 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 Hannō peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 15UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Hannō 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 Hannō 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 Hannō?

Hannō sits at 35.9°N, 139.3°E, 113 m above sea level, in Japan. The nearest listed city is Iruma, 6.0 km away.

Topography around Hannō

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

Within 3 km, the terrain around Hannō has only modest variations in elevation — a maximum elevation change of 189 m around an average of 137 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 955 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Hannō is covered by trees (50%) and artificial surfaces (40%) within 3 km, trees (55%) and artificial surfaces (34%) within 16 km, and trees (48%) and artificial surfaces (28%) within 80 km.

3 km
189 m
16 km
955 m
80 km
3,737 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Iruma 6.0 km · Hidaka 8.0 km · Sayama 8.0 km · Morohongō 9.0 km · Hakonegasaki 10 km · Hamura 10 km · Ōme 10 km · Yokota 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 Hannō (35.8519°, 139.3181°, elevation 113 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).