Ōuda-yamaguchi weather in September

In September, Ōuda-yamaguchi sees average daytime highs of 26°C and overnight lows near 18°C, with 219 mm of rain across 15.1 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Ōuda-yamaguchi's 9th-clearest and 9th-windiest month. For the whole year in context, see Ōuda-yamaguchi's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
219 mm
15.1 wet days
Daylight
12 h 12 min
5:44 AM – 5:57 PM
Cloud cover
66%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
4.01 kWh/m²
Travel score
5.7
out of 10

Ōuda-yamaguchi is city in Nara Prefecture, Japan.

Density
114/km²
people per km²
Founded
2006

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 28°C in the first days to 23°C by the end.

A typical September day in Ōuda-yamaguchi reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°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°35°151015202530
Avg high (°C)Avg low (°C)
12821
22820
32820
42820
52820
62820
72720
82720
92719
102719
112719
122719
132619
142619
152618
162618
172618
182518
192518
202517
212517
222517
232417
242416
252416
262416
272416
282316
292315
302315

How September really feels in Ōuda-yamaguchi

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.

Ōuda-yamaguchi weather by month

How September compares with the rest of the year at a glance. September is the 3rd-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°749.34.4100.5
Feb / -1°829.73.710.70.9
Mar11° / 13413.62.211.72.6
Apr17° / 13911.60.312.85.0
May21° / 12°16612.2013.86.1
Jun25° / 17°25316014.35.5
Jul28° / 21°23218.2014.14.6
Aug30° / 22°17615.5013.34.5
Sep26° / 18°21915.1012.25.7
Oct20° / 12°20112011.16.1
Nov14° / 988.5010.24.5
Dec / 748.81.89.71.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24060
34060
44060
54060
64060
74060
84060
94060
103961
114060
124060
133961
144060
153961
163961
173961
183763
193862
203763
213862
223862
233862
243961
253961
263961
274060
284060
294060
304159

Chance of precipitation in September

Any precipitation

Ōuda-yamaguchi gets around 219 mm of rain over 15.1 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 50% and peaks near 55% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
155
255
355
455
555
655
755
854
954
1053
1152
1251
1350
1449
1549
1648
1747
1847
1947
2047
2147
2247
2347
2447
2547
2648
2748
2848
2949
3049

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 45% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
116204330
216214329
327224228
427224227
528234126
628244125
739254024
839254023
9410263921
10411273820
11512273719
12513283618
13614283517
14716283416
15817283215
16919283113
171020283012
181121282811
191223282710
20132428269
21152528248
22162627237
23172727226
24182827206
25202927195
26213027184
27223127174
28233226153
29253226143
30263226132

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.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
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 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:33 AM to 5:55 AM, and sunset from 6:19 PM to 5:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:336:19
212.75:346:17
312.75:356:16
412.65:356:14
512.65:366:13
612.65:376:11
712.55:386:10
812.55:386:09
912.55:396:07
1012.45:406:06
1112.45:406:04
1212.45:416:03
1312.35:426:01
1412.35:436:00
1512.25:435:58
1612.25:445:57
1712.25:455:55
1812.15:465:54
1912.15:465:52
2012.15:475:51
2112.05:485:49
2212.05:495:48
2312.05:495:47
2411.95:505:45
2511.95:515:44
2611.85:525:42
2711.85:525:41
2811.85:535:39
2911.75:545:38
3011.75:555:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.01 kWh/m².

For context, solar energy here swings from a low near 2.48 kWh/m² to a high of 5.35 kWh/m² in May across the year — September's 4.01 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.2Bright
124.1Bright
134.1Bright
144.1Bright
154.0Bright
164.0Bright
174.0Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.8Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Ōuda-yamaguchi

In seasonPeak

In September, Ōuda-yamaguchi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Ōuda-yamaguchi 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 September a good time to visit Ōuda-yamaguchi?

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

5.7
Sightseeing
3rd-best month of the year
5.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Ōuda-yamaguchi for sightseeing.

What to pack for Ōuda-yamaguchi in September

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

In September, Ōuda-yamaguchi sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Ōuda-yamaguchi in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 54 km away) is warmest in August at about 27°C and coldest in February near 16°C.

It's comfortable for a long swim from May 21 to Nov 29 — about 6.3 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb16Cool
Mar16Cool
Apr18Cool
May20Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec19Cool

UV index in Ōuda-yamaguchi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Ōuda-yamaguchi peaks around June 20 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJun 20UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Very high
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Ōuda-yamaguchi 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 Ōuda-yamaguchi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1423 µg/m³Oct 1713 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug18Moderate
Sep14Moderate
Oct13Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Ōuda-yamaguchi?

Ōuda-yamaguchi sits at 34.5°N, 136.0°E, 398 m above sea level, in Japan. The nearest listed city is Haibara-akanedai, 8.0 km away.

Topography around Ōuda-yamaguchi

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

Within 3 km, the terrain around Ōuda-yamaguchi has only modest variations in elevation — a maximum elevation change of 245 m around an average of 409 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,367 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,882 m.

The land around Ōuda-yamaguchi is covered by trees (80%) within 3 km, trees (88%) within 16 km, and trees (62%) within 80 km.

3 km
245 m
16 km
1,367 m
80 km
1,882 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Haibara-akanedai 8.0 km · Sakurai 11 km · Kashihara-shi 16 km · Kashiwara 17 km · Shimobuchi 17 km · Tenri 18 km · Tawaramoto 18 km · Yamato-Takada 20 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 Ōuda-yamaguchi (34.4592°, 135.9536°, elevation 398 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).