Miyajima weather in September

In September, Miyajima sees average daytime highs of 27°C and overnight lows near 21°C, with 187 mm of rain across 11.7 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 31% 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 Miyajima's 8th-clearest and 8th-windiest month. For the whole year in context, see Miyajima's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
187 mm
11.7 wet days
Daylight
12 h 12 min
5:59 AM – 6:11 PM
Cloud cover
61%
8th clearest
Wind
9 km/h
8th windiest
Solar energy
4.24 kWh/m²
Travel score
6.1
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 25°C by the end.

A typical September day in Miyajima reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°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 3°C cooler than August and about 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12923
22923
32923
42923
52922
62822
72822
82822
92822
102822
112822
122821
132721
142721
152721
162721
172721
182720
192620
202620
212620
222620
232619
242619
252619
262519
272519
282518
292518
302518

How September really feels in Miyajima

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.

Miyajima 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 / 506.11101.8
Feb10° / 667.91.510.72.2
Mar13° / 1139.90.411.73.7
Apr18° / 10°1399.9012.85.7
May22° / 15°16110.1013.86.6
Jun25° / 19°22713.7014.25.9
Jul29° / 23°24915.1014.14.8
Aug30° / 24°15614.1013.34.4
Sep27° / 21°18711.7012.26.1
Oct22° / 15°1208.3011.17.1
Nov16° / 727.1010.25.6
Dec11° / 586.50.39.83.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24456
34456
44555
54456
64555
74555
84654
94753
104753
114852
124951
134951
145050
155050
165050
175050
185050
195050
205050
215050
225050
235050
245050
255050
265050
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Miyajima gets around 187 mm of rain over 11.7 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 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
246
345
445
544
644
743
843
943
1042
1142
1241
1340
1440
1539
1638
1738
1837
1937
2036
2136
2235
2335
2434
2534
2634
2733
2833
2933
3033

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 60% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101929556
201931545
3011032525
4011133514
5021233494
6021434473
7031534453
8041635433
9051735412
10151835392
11161934372
12182134352
13292233331
142102333311
153112432291
163132531271
174142630251
185152730231
195162729211
206182828201
217192927180
227203026160
238213125150
248233124140
259243223120
2610253222110
2711263221100
281226332090
291327331980
301428331770

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
68calm
78calm
88calm
98calm
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 5:48 AM to 6:09 AM, and sunset from 6:33 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:486:33
212.75:496:32
312.75:496:30
412.65:506:29
512.65:516:27
612.65:516:26
712.55:526:24
812.55:536:23
912.55:546:22
1012.45:546:20
1112.45:556:19
1212.45:566:17
1312.35:576:16
1412.35:576:14
1512.25:586:13
1612.25:596:11
1712.25:596:10
1812.16:006:08
1912.16:016:07
2012.16:026:05
2112.06:026:04
2212.06:036:03
2312.06:046:01
2411.96:056:00
2511.96:055:58
2611.86:065:57
2711.86:075:55
2811.86:085:54
2911.76:085:52
3011.76:095:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.24 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.57 kWh/m² in May across the year — September's 4.24 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
304.0Moderate
Planning a trip in September

Hazard calendar for Miyajima

In seasonPeak

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

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

Miyajima'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 Miyajima?

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

6.1
Sightseeing
3rd-best month of the year
6.3
Beach & pool
1st-best month of the year

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

What to pack for Miyajima in September

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

In September, Miyajima sees daytime highs around 27°C and nights near 21°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Miyajima 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 20 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 13 to Nov 17 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Miyajima 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 Miyajima peaks around July 13 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 highVery highModerateJul 13UV 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 Miyajima 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 Miyajima is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1022 µg/m³Oct 1310 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr22Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Moderate
Sep11Good
Oct10Good
Nov12Moderate
Dec12Good
Location & terrain

Where is Miyajima?

Miyajima sits at 34.3°N, 132.3°E, 0 m above sea level, in Japan. The nearest listed city is Ōno-hara, 5.0 km away.

Topography around Miyajima

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

Within 3 km, the terrain around Miyajima has significant variations in elevation — a maximum elevation change of 510 m around an average of 72 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,032 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,327 m.

The land around Miyajima is covered by water (47%) and trees (43%) within 3 km, trees (46%) and water (40%) within 16 km, and trees (60%) and water (33%) within 80 km.

3 km
510 m
16 km
1,032 m
80 km
1,327 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ōno-hara 5.0 km · Hatsukaichi 6.0 km · Ōtake 14 km · Etajima 16 km · Hiroshima 16 km · Iwakuni 18 km · Fuchū 20 km · Gion 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 Miyajima (34.2991°, 132.3219°, elevation 0 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).