Morioka weather in September

In September, Morioka sees average daytime highs of 21°C and overnight lows near 14°C, with 137 mm of rain across 12.4 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 18°C by the end. The sky is clear or mostly clear about 16% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Morioka's 9th-clearest and 9th-windiest month. For the whole year in context, see Morioka's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
137 mm
12.4 wet days
Daylight
12 h 18 min
5:22 AM – 5:37 PM
Cloud cover
72%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
3.47 kWh/m²
Travel score
5.8
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 September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 18°C by the end.

A typical September day in Morioka reaches about 21°C in the afternoon and slips back to 14°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12417
22317
32316
42316
52316
62316
72316
82316
92215
102215
112215
122215
132214
142114
152114
162114
172113
182113
192013
202012
212012
222012
231912
241911
251911
261911
271911
281810
291810
301810

How September really feels in Morioka

Once humidity and wind are folded in, September 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

September 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 September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22674
32674
42674
52872
62872
72971
82971
92971
103070
113070
123169
133268
143268
153268
163367
173367
183367
193367
203367
213466
223466
233466
243466
253664
263664
273664
283664
293664
303664

Chance of precipitation in September

Any precipitation

Morioka gets around 137 mm of rain over 12.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 43% and peaks near 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
248
347
447
547
647
747
846
946
1046
1145
1245
1344
1444
1543
1642
1742
1841
1940
2040
2139
2239
2338
2438
2538
2638
2739
2839
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
192333313
2102434293
3112534283
4112634263
5122634253
6142734232
7152833222
8172932202
9192932192
10213031181
11233030161
12253028151
13283027141
14313026121
15343024111
16373023101
1740302190
1843291980
1946291770
2049281660
2152281460
2255271350
2358261240
2461261030
256325930
266624820
276823720
287122610
297221610
307420510

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:08 AM to 5:36 AM, and sunset from 6:03 PM to 5:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:086:03
212.95:096:01
312.85:105:59
412.85:115:58
512.75:115:56
612.75:125:54
712.75:135:53
812.65:145:51
912.65:155:49
1012.55:165:48
1112.55:175:46
1212.45:185:44
1312.45:195:43
1412.35:205:41
1512.35:215:39
1612.35:225:37
1712.25:235:36
1812.25:245:34
1912.15:255:32
2012.15:265:31
2112.05:275:29
2212.05:285:27
2311.95:295:25
2411.95:305:24
2511.95:315:22
2611.85:325:20
2711.85:335:19
2811.75:345:17
2911.75:355:15
3011.65:365:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.47 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 — September's 3.47 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.6Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Is September a good time to visit Morioka?

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

5.8
Sightseeing
2nd-best month of the year
3.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Morioka for sightseeing.

What to pack for Morioka in September

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

In September, Morioka sees daytime highs around 21°C and nights near 14°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in Morioka in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. 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 September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September 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
September 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).