Yotsutsuji weather in September

In September, Yotsutsuji sees average daytime highs of 26°C and overnight lows near 20°C, with 220 mm of rain across 14.5 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 24°C by the end. The sky is clear or mostly clear about 19% 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 Yotsutsuji's 10th-clearest and 9th-windiest month. For the whole year in context, see Yotsutsuji's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
220 mm
14.5 wet days
Daylight
12 h 12 min
5:47 AM – 6:01 PM
Cloud cover
68%
10th clearest
Wind
9 km/h
9th windiest
Solar energy
3.9 kWh/m²
Travel score
5.7
out of 10

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 24°C by the end.

A typical September day in Yotsutsuji reaches about 26°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°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
22922
32922
42922
52822
62822
72821
82821
92821
102821
112721
122720
132720
142720
152720
162620
172620
182619
192619
202619
212519
222519
232518
242518
252518
262418
272418
282417
292417
302417

How September really feels in Yotsutsuji

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.

Yotsutsuji 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 / 9518.27.89.90.8
Feb / 8414.76.710.71.2
Mar12° / 12514.92.111.72.8
Apr18° / 11911.9012.95.3
May22° / 13°15711.9013.86.4
Jun25° / 18°19514.2014.45.7
Jul29° / 23°23917.5014.24.3
Aug31° / 24°17714.1013.34.1
Sep26° / 20°22014.5012.25.7
Oct21° / 14°14610.8011.16.4
Nov16° / 9312.2010.14.6
Dec10° / 9515.82.99.62.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23763
33664
43664
53664
63763
73763
83763
93763
103862
113862
123862
133862
143763
153763
163862
173862
183763
193763
203763
213763
223763
233862
243862
253862
263961
273961
283961
294159
304159

Chance of precipitation in September

Any precipitation

Yotsutsuji gets around 220 mm of rain over 14.5 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 48% and peaks near 53% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
153
253
353
453
553
653
753
852
952
1051
1150
1249
1349
1448
1547
1647
1746
1846
1945
2045
2145
2245
2345
2445
2544
2644
2744
2844
2944
3043

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 54% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021231532
2021332512
3021532501
4021633481
5031733461
6031934431
7042034411
8042135391
9152335361
10162435340
11172535320
12272635290
13282735270
143102834250
153112934230
164123033210
174133132190
185143232170
196163331150
207173329140
217183428120
228203427110
239213525100
241023352480
251124352270
261225352160
271426352050
281527351850
291628341740
301829341630

Wind in September

Winds average 9 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
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 5:58 AM, and sunset from 6:23 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:366:23
212.85:366:21
312.75:376:20
412.75:386:19
512.65:396:17
612.65:406:16
712.65:406:14
812.55:416:13
912.55:426:11
1012.45:436:10
1112.45:436:08
1212.45:446:07
1312.35:456:05
1412.35:466:04
1512.35:476:02
1612.25:476:01
1712.25:485:59
1812.15:495:57
1912.15:505:56
2012.15:505:54
2112.05:515:53
2212.05:525:51
2312.05:535:50
2411.95:545:48
2511.95:545:47
2611.85:555:45
2711.85:565:44
2811.85:575:42
2911.75:585:41
3011.75:585:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.9 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 5.45 kWh/m² in May across the year — September's 3.9 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.2Bright
74.2Bright
84.2Bright
94.1Bright
104.1Bright
114.0Bright
124.0Bright
134.0Moderate
144.0Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Yotsutsuji

In seasonPeak

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

Yotsutsuji 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 Yotsutsuji?

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
5.6
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Yotsutsuji for sightseeing.

What to pack for Yotsutsuji in September

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

In September, Yotsutsuji sees daytime highs around 26°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Yotsutsuji in September

The nearest coast averages about 25°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 23 km away) is warmest in August at about 27°C and coldest in March near 12°C.

It's comfortable for a long swim from Jun 13 to Nov 7 — about 4.9 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Yotsutsuji 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 Yotsutsuji peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 17UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Yotsutsuji 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 Yotsutsuji is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Oct 1811 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun18Moderate
Jul17Moderate
Aug17Moderate
Sep13Moderate
Oct11Good
Nov12Moderate
Dec12Good
Location & terrain

Where is Yotsutsuji?

Yotsutsuji sits at 35.5°N, 135.1°E, 34 m above sea level, in Japan. The nearest listed city is Miyazu, 9.0 km away.

Topography around Yotsutsuji

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

Within 3 km, the terrain around Yotsutsuji has significant variations in elevation — a maximum elevation change of 333 m around an average of 85 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 831 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,487 m.

The land around Yotsutsuji is covered by trees (70%) within 3 km, trees (86%) within 16 km, and trees (58%) and water (35%) within 80 km.

3 km
333 m
16 km
831 m
80 km
1,487 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Miyazu 9.0 km · Kyōtango 10 km · Maizuru 23 km · Toyooka 25 km · Fukuchiyama 26 km · Ayabe 29 km · Wadayama 32 km · Yabu 33 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 Yotsutsuji (35.5333°, 135.1°, elevation 34 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).