Sōja weather in September

In September, Sōja sees average daytime highs of 28°C and overnight lows near 20°C, with 182 mm of rain across 11.4 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 26% of the time in September, and the air most often feels humid.

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 Sōja's 9th-clearest and 7th-windiest month. For the whole year in context, see Sōja's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
182 mm
11.4 wet days
Daylight
12 h 12 min
5:53 AM – 6:06 PM
Cloud cover
63%
9th clearest
Wind
8 km/h
7th windiest
Solar energy
4.19 kWh/m²
Travel score
5.6
out of 10

Sōja is City in Okayama Prefecture, Japan.

Density
326/km²
people per km²
Founded
2005

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 31°C in the first days to 26°C by the end.

A typical September day in Sōja reaches about 28°C in the afternoon and slips back to 20°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°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)
13122
23122
33122
43022
53022
63022
73021
83021
93021
102921
112921
122920
132920
142920
152820
162820
172819
182819
192819
202719
212718
222718
232718
242718
252618
262617
272617
282617
292617
302617

How September really feels in Sōja

Once humidity and wind are folded in, September averages 4 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
4
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.

Sōja 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 / 425.60.69.92.0
Feb10° / 506.6110.72.4
Mar14° / 969.90.211.74.0
Apr19° / 11510012.86.1
May24° / 14°13310.4013.86.7
Jun27° / 19°18312.6014.35.7
Jul31° / 23°19914.1014.14.1
Aug32° / 24°12311.1013.33.7
Sep28° / 20°18211.4012.25.6
Oct23° / 13°1158.1011.17.1
Nov17° / 596.5010.25.9
Dec11° / 495.50.29.73.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24555
34555
44654
54753
64654
74654
84654
94654
104753
114654
124654
134753
144654
154654
164654
174555
184654
194555
204555
214555
224555
234654
244555
254654
264654
274753
284753
294852
304852

Chance of precipitation in September

Any precipitation

Sōja gets around 182 mm of rain over 11.4 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 37% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
340
440
540
640
740
840
940
1040
1140
1239
1339
1438
1538
1637
1737
1837
1936
2036
2135
2235
2335
2434
2534
2634
2734
2833
2933
3033

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 46% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1071829442
2171929422
3182029411
4182130391
5192130371
6292230351
72102331341
83112331321
93122431301
104122431281
115132530261
126142530241
137152629231
148162629211
159172628191
1611182626181
1712182726161
1813192725151
1915202724141
2016212722131
2117222721121
2218232720101
231925271990
242126281880
252227281670
262328271570
272428271560
282529271450
292730261340
302830251240

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
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 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 5:42 AM to 6:04 AM, and sunset from 6:28 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:426:28
212.75:436:26
312.75:436:25
412.75:446:23
512.65:456:22
612.65:466:20
712.55:466:19
812.55:476:18
912.55:486:16
1012.45:486:15
1112.45:496:13
1212.45:506:12
1312.35:516:10
1412.35:516:09
1512.35:526:07
1612.25:536:06
1712.25:546:04
1812.15:546:03
1912.15:556:01
2012.15:566:00
2112.05:575:58
2212.05:575:57
2312.05:585:55
2411.95:595:54
2511.96:005:52
2611.86:005:51
2711.86:015:49
2811.86:025:48
2911.76:035:47
3011.76:045:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.19 kWh/m².

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 5.62 kWh/m² in May across the year — September's 4.19 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.2Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Moderate
254.0Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Sōja

In seasonPeak

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

Sōja sits in the Pacific typhoon belt; the season peaks July–October.

Sōja's rainy season runs March–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Sōja?

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

5.6
Sightseeing
6th-best month of the year
6.4
Beach & pool
1st-best month of the year

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

What to pack for Sōja in September

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

In September, Sōja sees daytime highs around 28°C and nights near 20°C. Pack light clothes. Worth having: rain gear. About 11 days see rain.

light clothesrain gear

Sea temperature near Sōja in September

The nearest coast averages about 27°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 35 km away) is warmest in August at about 28°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 12 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug28Warm
Sep27Warm
Oct23Refreshing
Nov20Cool
Dec16Cool

UV index in Sōja 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 Sōja peaks around July 15 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highExtremeVery highModerateJul 15UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Sōja 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 Sōja is worst in April — around 24 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1324 µg/m³Dec 1414 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May22Moderate
Jun20Moderate
Jul17Moderate
Aug17Moderate
Sep16Moderate
Oct14Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Sōja?

Sōja sits at 34.7°N, 133.8°E, 19 m above sea level, in Japan. The nearest listed city is Kurashiki, 10 km away.

Topography around Sōja

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

Within 3 km, the terrain around Sōja has significant variations in elevation — a maximum elevation change of 292 m around an average of 27 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 588 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,692 m.

The land around Sōja is covered by artificial surfaces (40%), trees (25%) and cropland (24%) within 3 km, trees (59%) and artificial surfaces (23%) within 16 km, and trees (65%) and water (23%) within 80 km.

3 km
292 m
16 km
588 m
80 km
1,692 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kurashiki 10 km · Okayama 17 km · Takahashi 17 km · Asakuchi 21 km · Kamogatachō-kamogata 21 km · Tamano 25 km · Ibara 27 km · Akaiwa 29 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 Sōja (34.6753°, 133.7509°, elevation 19 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).