Morioka weather in August

In August, Morioka sees average daytime highs of 25°C and overnight lows near 18°C, with 137 mm of rain across 14.6 wet days and about 13.6 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 24°C by the end. The sky is clear or mostly clear about 15% 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 13 hours by month's end. Set against the rest of the year, August is Morioka's 10th-clearest and 12th-windiest month. For the whole year in context, see Morioka's year-round climate.

Daytime high
25°
1st warmest
Overnight low
18°
12th coldest
Rainfall
137 mm
14.6 wet days
Daylight
13 h 36 min
4:52 AM – 6:27 PM
Cloud cover
73%
10th clearest
Wind
7 km/h
12th windiest
Solar energy
4.16 kWh/m²
Travel score
5.9
out of 10

Morioka is city in Iwate Prefecture, Japan.

Density
328/km²
people per km²
Founded
1889

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 25°C in the first days to 24°C by the end.

A typical August day in Morioka reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°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°151015202531
Avg high (°C)Avg low (°C)
12519
22519
32619
42619
52619
62619
72619
82619
92519
102519
112519
122518
132518
142518
152518
162518
172518
182518
192518
202518
212518
222518
232418
242418
252417
262417
272417
282417
292417
302417
312417

How August really feels in Morioka

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.

Morioka weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -9°6411.414.59.50.0
Feb-0° / -9°6011.112.810.40.0
Mar / -5°9314.712.611.70.1
Apr11° / 92144.3132.3
May17° / 9412.80.314.24.8
Jun20° / 13°10112.3014.85.6
Jul24° / 17°14816.3014.55.6
Aug25° / 18°13714.6013.65.9
Sep21° / 14°13712.4012.35.8
Oct15° / 11011.40.210.94.3
Nov / 78134.39.81.3
Dec / -6°7713.213.39.20.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 12% of August, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22773
32773
42872
52872
62872
72773
82773
92773
102773
112674
122674
132575
142575
152674
162674
172674
182773
192773
202773
212773
222773
232872
242872
252872
262773
272773
282773
292674
302674
312674

Chance of precipitation in August

Any precipitation

Morioka gets around 137 mm of rain over 14.6 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 47% and peaks near 48% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
545
645
745
845
946
1046
1146
1246
1347
1447
1548
1648
1748
1848
1948
2048
2148
2248
2348
2448
2548
2648
2748
2848
2948
3048
3148

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 54% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121023587
221022597
321022597
421022597
521022597
621022597
721123577
821123577
921124567
1021124567
1121125557
1221126547
1331126537
1431227517
1531228507
1631229497
1741229487
1841230477
1951330467
2051330447
2161430437
2261531426
2361531426
2471631416
2571731405
2671732395
2781832385
2881932364
2982033354
3092133344
3192233323

Wind in August

Winds average 7 km/h in August, the calmest month.

Across August, daily wind ranges from about 7 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
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 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 4:38 AM to 5:07 AM, and sunset from 6:45 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.14:386:45
214.14:396:44
314.04:406:43
414.04:416:42
514.04:426:41
613.94:436:39
713.94:446:38
813.94:456:37
913.84:456:36
1013.84:466:35
1113.84:476:33
1213.74:486:32
1313.74:496:31
1413.74:506:29
1513.64:516:28
1613.64:526:27
1713.54:536:25
1813.54:546:24
1913.54:556:23
2013.44:566:21
2113.44:576:20
2213.34:586:18
2313.34:596:17
2413.35:006:15
2513.25:016:14
2613.25:026:12
2713.15:036:11
2813.15:046:09
2913.05:056:07
3013.05:066:06
3113.05:076:04

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.16 kWh/m².

For context, solar energy here swings from a low near 1.9 kWh/m² to a high of 5.18 kWh/m² in May across the year — August's 4.16 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Bright
224.0Moderate
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
313.8Moderate
Planning a trip in August

Is August a good time to visit Morioka?

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

5.9
Sightseeing
1st-best month of the year
5.3
Beach & pool
1st-best month of the year

August is a reasonable time to visit Morioka for sightseeing.

What to pack for Morioka in August

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

In August, Morioka sees daytime highs around 25°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

UV index in Morioka 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 Morioka 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
Nov2Moderate
Dec2Low

Air quality in Morioka 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 Morioka is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1420 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May19Moderate
Jun14Moderate
Jul12Moderate
Aug11Good
Sep11Good
Oct12Good
Nov11Good
Dec9Good
Location & terrain

Where is Morioka?

Morioka sits at 39.7°N, 141.2°E, 138 m above sea level, in Japan. The nearest listed city is Yahaba, 10 km away.

Topography around Morioka

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

Within 3 km, the terrain around Morioka has only modest variations in elevation — a maximum elevation change of 237 m around an average of 142 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 852 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,987 m.

The land around Morioka is covered by artificial surfaces (66%) and trees (27%) within 3 km, trees (68%) within 16 km, and trees (86%) within 80 km.

3 km
237 m
16 km
852 m
80 km
1,987 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Yahaba 10 km · Takizawa 12 km · Shizukuishi 14 km · Hizume 17 km · Hachimantai 22 km · Semboku 35 km · Hanamaki 35 km · Kitakami 46 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 Morioka (39.7°, 141.15°, elevation 138 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. 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).