Ōkubo-naka weather in September

In September, Ōkubo-naka sees average daytime highs of 29°C and overnight lows near 22°C, with 176 mm of rain across 12.3 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 31°C in the first days to 26°C by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels oppressive.

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 Ōkubo-naka's 9th-clearest and 9th-windiest month. For the whole year in context, see Ōkubo-naka's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
176 mm
12.3 wet days
Daylight
12 h 12 min
5:47 AM – 5:59 PM
Cloud cover
61%
9th clearest
Wind
9 km/h
9th windiest
Solar energy
4.29 kWh/m²
Travel score
5.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 31°C in the first days to 26°C by the end.

A typical September day in Ōkubo-naka reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13124
23124
33124
43124
53024
63023
73023
83023
93023
103023
112923
122922
132922
142922
152922
162922
172821
182821
192821
202821
212821
222720
232720
242720
252720
262720
272619
282619
292619
302619

How September really feels in Ōkubo-naka

Once humidity and wind are folded in, September averages 8 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
8
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Ōkubo-naka 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 / 607.80.6102.1
Feb10° / 668.30.810.72.4
Mar14° / 10711.20.111.73.8
Apr19° / 11°11310.4012.85.9
May24° / 16°13410.2013.86.7
Jun27° / 20°19413.7014.35.6
Jul30° / 24°17713.1014.14.3
Aug32° / 25°10710.2013.33.8
Sep29° / 22°17612.3012.25.4
Oct23° / 16°1599.8011.16.9
Nov17° / 10°857.9010.25.8
Dec12° / 698.20.19.73.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% 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 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34852
44852
54852
64852
74753
84753
94852
104852
114753
124753
134753
144852
154852
164753
174654
184654
194555
204654
214654
224555
234654
244654
254753
264753
274753
284852
294852
304852

Chance of precipitation in September

Any precipitation

Ōkubo-naka gets around 176 mm of rain over 12.3 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 40% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
240
341
441
542
642
743
843
943
1042
1142
1241
1341
1440
1539
1639
1739
1839
1938
2038
2138
2238
2338
2438
2538
2638
2739
2839
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 62% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10210255310
2021026539
3021126529
4031227508
5031228497
6131328487
7141429466
8141430456
9151531435
10161631415
11261732394
12271832374
13281932353
14392032333
153102132313
164112232292
174122331272
185142431252
196152530232
206162630211
217172729191
228182728171
238192827161
249202926141
2510213025131
2611223124121
2711223224101
281223332390
291323332280
301424332170

Wind in September

Winds average 9 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
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

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 5:36 AM to 5:57 AM, and sunset from 6:21 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:366:21
212.75:366:20
312.75:376:18
412.65:386:17
512.65:396:15
612.65:396:14
712.55:406:12
812.55:416:11
912.55:426:10
1012.45:426:08
1112.45:436:07
1212.45:446:05
1312.35:446:04
1412.35:456:02
1512.25:466:01
1612.25:475:59
1712.25:475:58
1812.15:485:56
1912.15:495:55
2012.15:505:53
2112.05:505:52
2212.05:515:50
2312.05:525:49
2411.95:535:48
2511.95:535:46
2611.85:545:45
2711.85:555:43
2811.85:565:42
2911.75:565:40
3011.75:575:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.29 kWh/m².

For context, solar energy here swings from a low near 2.42 kWh/m² to a high of 5.55 kWh/m² in May across the year — September's 4.29 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.1Bright
244.0Bright
254.0Moderate
264.0Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Ōkubo-naka

In seasonPeak

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

Ōkubo-naka 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 Ōkubo-naka?

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

5.4
Sightseeing
6th-best month of the year
6.4
Beach & pool
1st-best month of the year

September is a reasonable time to visit Ōkubo-naka for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Ōkubo-naka in September

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

In September, Ōkubo-naka sees daytime highs around 29°C and nights near 22°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Ōkubo-naka 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 20 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 3 to Nov 16 — about 5.5 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Ōkubo-naka in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Ōkubo-naka peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highModerateJun 23UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug7High
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Ōkubo-naka 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 Ōkubo-naka is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1625 µg/m³Oct 1914 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar24Moderate
Apr26Moderate
May24Moderate
Jun21Moderate
Jul22Moderate
Aug24Moderate
Sep17Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Ōkubo-naka?

Ōkubo-naka sits at 34.4°N, 135.3°E, 23 m above sea level, in Japan. The nearest listed city is Izumisano, 3.0 km away.

Topography around Ōkubo-naka

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

Within 3 km, the terrain around Ōkubo-naka has only modest variations in elevation — a maximum elevation change of 135 m around an average of 33 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 891 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,879 m.

The land around Ōkubo-naka is covered by artificial surfaces (69%) within 3 km, trees (38%), water (34%) and artificial surfaces (22%) within 16 km, and trees (53%) and water (29%) within 80 km.

3 km
135 m
16 km
891 m
80 km
1,879 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Izumisano 3.0 km · Kaizuka 5.0 km · Kishiwada 7.0 km · Sennan 9.0 km · Tadaoka-higashi 11 km · Hannan 12 km · Izumiōtsu 12 km · Izumi 12 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 Ōkubo-naka (34.4045°, 135.3409°, elevation 23 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).