Unnan weather in August

In August, Unnan sees average daytime highs of 30°C and overnight lows near 23°C, with 161 mm of rain across 15.1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 4th-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 24% 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 Unnan's 5th-clearest and 11th-windiest month. For the whole year in context, see Unnan's year-round climate.

Daytime high
30°
1st warmest
Overnight low
23°
12th coldest
Rainfall
161 mm
15.1 wet days
Daylight
13 h 18 min
5:32 AM – 6:53 PM
Cloud cover
64%
5th clearest
Wind
9 km/h
11th windiest
Solar energy
5.2 kWh/m²
Travel score
4.4
out of 10

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 Unnan 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 33°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
103123
113123
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223022
233022
242922
252922
262922
272922
282922
292922
302921
312821

How August really feels in Unnan

Once humidity and wind are folded in, August averages 22 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
22
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.

Unnan weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 1071710.39.90.6
Feb / 10014.88.410.71.0
Mar12° / 12814.93.211.72.7
Apr17° / 11711.40.212.95.3
May22° / 13°12811013.86.4
Jun25° / 18°17514.4014.35.8
Jul29° / 22°22916.6014.14.6
Aug30° / 23°16115.1013.34.4
Sep26° / 18°21314.1012.25.9
Oct20° / 12°11610.6011.16.3
Nov15° / 9411.20.310.14.3
Dec / 11416.36.19.71.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% 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 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34456
44456
54456
64456
74456
84357
94357
104258
114159
124159
134060
144060
154060
164060
174060
184060
194060
204060
214060
224060
234060
244060
253961
263862
273862
283862
293763
303763
313763

Chance of precipitation in August

Any precipitation

Unnan gets around 161 mm of rain over 15.1 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 49% and peaks near 53% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
545
645
745
845
946
1046
1147
1248
1349
1450
1550
1651
1751
1852
1952
2052
2152
2253
2353
2453
2552
2652
2752
2852
2952
3052
3152

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 61% 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 (%)
10223732
20222742
30222742
40222742
50222742
60223732
70223732
80223732
90224722
100224722
110225712
120225712
131326682
141326682
151327672
161428652
171428652
181430632
192531602
202632582
212633572
222734552
232836522
242837512
252938491
2631039461
2731140441
2831241421
2931442411
3041542391
3141642371

Wind in August

Winds average 9 km/h in August.

Across August, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
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 5:21 AM to 5:44 AM, and sunset from 7:08 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:217:08
213.85:217:07
313.75:227:06
413.75:237:06
513.75:247:05
613.75:257:04
713.65:257:03
813.65:267:02
913.65:277:01
1013.55:286:59
1113.55:286:58
1213.55:296:57
1313.45:306:56
1413.45:316:55
1513.45:326:54
1613.35:326:53
1713.35:336:51
1813.35:346:50
1913.25:356:49
2013.25:356:48
2113.25:366:46
2213.15:376:45
2313.15:386:44
2413.15:396:43
2513.05:396:41
2613.05:406:40
2713.05:416:38
2812.95:426:37
2912.95:426:36
3012.95:436:34
3112.85:446:33

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.2 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 5.72 kWh/m² in May across the year — August's 5.2 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.4Bright
95.4Bright
105.4Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
244.9Bright
254.9Bright
264.9Bright
274.8Bright
284.8Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in August

Hazard calendar for Unnan

In seasonPeak

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

Unnan 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 Unnan?

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
6.0
Beach & pool
1st-best month of the year

August is a reasonable time to visit Unnan for sightseeing.

What to pack for Unnan in August

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

In August, Unnan sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Unnan 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 29 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 12 to Nov 15 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun21Refreshing
Jul24Warm
Aug27Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Unnan 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 Unnan peaks around July 18 at about 10 (extreme) — 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 highExtremeVery highModerateJul 18UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun9Very high
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Unnan 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 Unnan is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1222 µg/m³Oct 1310 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb16Moderate
Mar21Moderate
Apr22Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep11Good
Oct10Good
Nov12Good
Dec11Good
Location & terrain

Where is Unnan?

Unnan sits at 35.2°N, 132.9°E, 82 m above sea level, in Japan. The nearest listed city is Izumo, 18 km away.

Topography around Unnan

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

Within 3 km, the terrain around Unnan has significant variations in elevation — a maximum elevation change of 398 m around an average of 240 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,049 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,623 m.

The land around Unnan is covered by trees (94%) within 3 km, trees (92%) within 16 km, and trees (60%) and water (35%) within 80 km.

3 km
398 m
16 km
1,049 m
80 km
1,623 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Izumo 18 km · Hiratachō 22 km · Matsue 30 km · Ōdachō-ōda 36 km · Yasugichō 37 km · Sakaiminato 44 km · Yonago 45 km · Shōbara 45 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 Unnan (35.2431°, 132.8999°, elevation 82 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).