Sayō weather in September

In September, Sayō sees average daytime highs of 27°C and overnight lows near 19°C, with 184 mm of rain across 11.8 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 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 28% 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 Sayō's 8th-clearest and 6th-windiest month. For the whole year in context, see Sayō's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
184 mm
11.8 wet days
Daylight
12 h 12 min
5:50 AM – 6:03 PM
Cloud cover
63%
8th clearest
Wind
8 km/h
6th windiest
Solar energy
4.28 kWh/m²
Travel score
5.9
out of 10

Sayō is town in Sayo District, Hyogo Prefecture, Japan.

Density
52/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 29°C in the first days to 25°C by the end.

A typical September day in Sayō reaches about 27°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12922
22921
32921
42921
52921
62921
72921
82821
92820
102820
112820
122820
132820
142719
152719
162719
172719
182719
192718
202618
212618
222618
232618
242617
252517
262517
272517
282517
292516
302516

How September really feels in Sayō

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.

Sayō 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 / 445.81.69.91.4
Feb / 567.2210.71.8
Mar13° / 11010.80.411.73.4
Apr18° / 12210.4012.95.7
May23° / 13°14510.6013.86.6
Jun26° / 18°18513.5014.35.8
Jul30° / 22°21715.7014.14.4
Aug31° / 23°13413.3013.34.2
Sep27° / 19°18411.8012.25.9
Oct22° / 13°1178011.17.0
Nov16° / 626.1010.25.4
Dec10° / 5160.69.72.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24654
34555
44555
54555
64654
74654
84654
94654
104555
114555
124555
134555
144456
154456
164357
174357
184258
194258
204357
214258
224258
234357
244357
254357
264357
274456
284654
294654
304654

Chance of precipitation in September

Any precipitation

Sayō gets around 184 mm of rain over 11.8 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 39% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
345
444
544
644
743
843
942
1042
1142
1241
1340
1440
1539
1638
1738
1837
1937
2036
2136
2236
2335
2435
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 26% 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 (%)
1051829452
2051929442
3062030422
4072130401
5172230381
6182330361
7192430351
81102530331
92112630311
102122730291
113132730271
124142829251
135152829231
146162828211
157182827201
168192926181
179202925161
1810212924151
1912222923130
2013232922120
2115242921110
2216252920100
231726281990
241827281880
252028281770
262129271660
272330271650
282430261550
292631251440
302831251330

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 9 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
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 5:39 AM to 6:01 AM, and sunset from 6:25 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:396:25
212.75:406:24
312.75:416:23
412.75:416:21
512.65:426:20
612.65:436:18
712.65:446:17
812.55:446:15
912.55:456:14
1012.45:466:12
1112.45:476:11
1212.45:476:09
1312.35:486:08
1412.35:496:06
1512.35:506:05
1612.25:506:03
1712.25:516:02
1812.15:526:00
1912.15:535:59
2012.15:535:57
2112.05:545:56
2212.05:555:54
2312.05:565:53
2411.95:565:51
2511.95:575:50
2611.85:585:48
2711.85:595:47
2811.86:005:45
2911.76:005:44
3011.76:015:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.28 kWh/m².

For context, solar energy here swings from a low near 2.29 kWh/m² to a high of 5.73 kWh/m² in May across the year — September's 4.28 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.1Bright
244.0Bright
254.0Bright
264.0Moderate
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Sayō

In seasonPeak

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

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

Sayō'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 Sayō?

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

5.9
Sightseeing
3rd-best month of the year
6.2
Beach & pool
1st-best month of the year

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

What to pack for Sayō in September

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

In September, Sayō sees daytime highs around 27°C and nights near 19°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Sayō 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 42 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 12 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov20Cool
Dec16Cool

UV index in Sayō 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 Sayō 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
Apr7High
May9Very high
Jun10Very high
Jul11Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Sayō 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 Sayō is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1421 µg/m³Oct 1711 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar20Moderate
Apr21Moderate
May19Moderate
Jun17Moderate
Jul14Moderate
Aug12Moderate
Sep12Good
Oct10Good
Nov12Good
Dec11Good
Location & terrain

Where is Sayō?

Sayō sits at 35.0°N, 134.4°E, 155 m above sea level, in Japan. The nearest listed city is Kamigōri, 14 km away.

Topography around Sayō

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

Within 3 km, the terrain around Sayō has significant variations in elevation — a maximum elevation change of 354 m around an average of 183 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 844 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,489 m.

The land around Sayō is covered by trees (76%) within 3 km, trees (89%) within 16 km, and trees (64%) and water (23%) within 80 km.

3 km
354 m
16 km
844 m
80 km
1,489 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kamigōri 14 km · Yamazakichō-nakabirose 17 km · Shisō 19 km · Hayashino 19 km · Tatsunochō-tominaga 23 km · Aioi 24 km · Tatsuno 25 km · Bizen 27 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 Sayō (35.0027°, 134.359°, elevation 155 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).