Ōshū weather in August

In August, Ōshū sees average daytime highs of 26°C and overnight lows near 19°C, with 153 mm of rain across 15.2 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 25°C by the end. The sky is clear or mostly clear about 14% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 06 min at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Ōshū's 10th-clearest and 12th-windiest month. For the whole year in context, see Ōshū's year-round climate.

Daytime high
26°
1st warmest
Overnight low
19°
12th coldest
Rainfall
153 mm
15.2 wet days
Daylight
13 h 30 min
4:53 AM – 6:26 PM
Cloud cover
74%
10th clearest
Wind
6 km/h
12th windiest
Solar energy
4.24 kWh/m²
Travel score
5.6
out of 10

Ōshū is city in Iwate Prefecture, Japan.

Density
114/km²
people per km²
Founded
2006

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 27°C in the first days to 25°C by the end.

A typical August day in Ōshū reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12720
22720
32720
42720
52720
62720
72720
82720
92720
102720
112720
122720
132720
142720
152620
162620
172619
182619
192619
202619
212619
222619
232619
242619
252619
262619
272519
282518
292518
302518
312518

How August really feels in Ōshū

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.

Ōshū weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°5810.7129.60.0
Feb / -7°5310.19.710.50.0
Mar / -3°9213.28.211.70.6
Apr13° / 9813.42.2133.3
May18° / 11012.5014.15.4
Jun21° / 14°12312.9014.75.7
Jul25° / 18°16616.5014.55.5
Aug26° / 19°15315.2013.55.6
Sep22° / 15°15113.5012.35.8
Oct17° / 12011.20115.0
Nov10° / 7311.72.29.92.2
Dec / -3°6812.48.89.30.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52971
62971
72971
83070
93070
102971
112872
122872
132872
142872
152872
162872
172872
182971
192872
202872
212872
222872
232872
242971
252971
262872
272773
282773
292872
302773
312773

Chance of precipitation in August

Any precipitation

Ōshū gets around 153 mm of rain over 15.2 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 51% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
446
546
647
747
847
947
1048
1148
1248
1349
1449
1550
1650
1750
1850
1951
2050
2150
2250
2350
2450
2550
2650
2750
2849
2949
3049
3149

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the muggy band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
116174630
216174531
316164531
416164532
517164532
617164532
717164532
817164531
917164531
1017174531
1117174530
1217174530
1317184529
1417184529
1517194528
1617194428
1728204427
1828214327
1929224226
2029224125
21210234025
22210243924
23211253823
24212263723
25213273622
26213283621
27214293520
28215303419
29215313418
30316313317
31317323216

Wind in August

Winds average 6 km/h in August, the calmest month.

Across August, daily wind ranges from about 6 km/h on the calmest days to 7 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
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 06 min at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:39 AM to 5:07 AM, and sunset from 6:44 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.14:396:44
214.04:406:43
314.04:416:42
414.04:426:40
513.94:436:39
613.94:446:38
713.94:456:37
813.84:466:36
913.84:476:35
1013.84:476:34
1113.74:486:32
1213.74:496:31
1313.74:506:30
1413.64:516:28
1513.64:526:27
1613.54:536:26
1713.54:546:24
1813.54:556:23
1913.44:566:22
2013.44:576:20
2113.34:586:19
2213.34:596:17
2313.35:006:16
2413.25:016:14
2513.25:026:13
2613.15:026:11
2713.15:036:10
2813.15:046:08
2913.05:056:07
3013.05:066:05
3112.95:076:04

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.24 kWh/m².

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 5.24 kWh/m² in May across the year — August's 4.24 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Bright
254.0Moderate
264.0Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
313.8Moderate
Planning a trip in August

Hazard calendar for Ōshū

In seasonPeak

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

Ōshū 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 Ōshū?

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

5.6
Sightseeing
3rd-best month of the year
5.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Ōshū for sightseeing.

What to pack for Ōshū in August

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

In August, Ōshū sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Ōshū in August

The nearest coast averages about 22°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 49 km away) is warmest in August at about 22°C and coldest in March near 7°C.

It's comfortable for a long swim from Jul 21 to Oct 3 — about 2.5 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb8Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun17Cool
Jul20Cool
Aug22Refreshing
Sep22Refreshing
Oct19Cool
Nov16Cool
Dec13Bracing

UV index in Ōshū 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 Ōshū peaks around August 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 19UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul6High
Aug9Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Ōshū 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 Ōshū is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1620 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May19Moderate
Jun14Moderate
Jul12Moderate
Aug11Good
Sep11Good
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Ōshū?

Ōshū sits at 39.1°N, 141.2°E, 36 m above sea level, in Japan. The nearest listed city is Mizusawa, 3.0 km away.

Topography around Ōshū

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

Within 3 km, the terrain around Ōshū has only modest variations in elevation — a maximum elevation change of 104 m around an average of 45 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 767 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,007 m.

The land around Ōshū is covered by artificial surfaces (38%), cropland (32%) and trees (23%) within 3 km, trees (59%) and cropland (30%) within 16 km, and trees (71%) within 80 km.

3 km
104 m
16 km
767 m
80 km
2,007 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Mizusawa 3.0 km · Kanegasaki 8.0 km · Kitakami 17 km · Ichinoseki 25 km · Hanamaki 27 km · Tōno 37 km · Rikuzen-Takata 44 km · Kesennuma 44 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 Ōshū (39.1393°, 141.1685°, elevation 36 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).