Iwakuni weather in October

In October, Iwakuni sees average daytime highs of 22°C and overnight lows near 15°C, with 116 mm of rain across 8 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 45% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Iwakuni's 1st-clearest and 5th-windiest month. For the whole year in context, see Iwakuni's year-round climate.

Daytime high
22°
6th warmest
Overnight low
15°
8th coldest
Rainfall
116 mm
8 wet days
Daylight
11 h 06 min
6:22 AM – 5:30 PM
Cloud cover
49%
1st clearest
Wind
9 km/h
5th windiest
Solar energy
3.68 kWh/m²
Travel score
7.1
out of 10

Iwakuni is city in Yamaguchi Prefecture, Japan.

Density
148/km²
people per km²
Founded
2006

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 20°C by the end.

A typical October day in Iwakuni reaches about 22°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°C. Set against its neighbours, October runs about 5°C cooler than September and about 6°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12418
22418
32417
42417
52417
62417
72417
82316
92316
102316
112316
122316
132315
142215
152215
162215
172215
182214
192114
202114
212114
222114
232113
242113
252013
262013
272013
282012
292012
301912
311912

How October really feels in Iwakuni

Once humidity and wind are folded in, October 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

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Iwakuni weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 506.21101.8
Feb10° / 677.81.510.72.1
Mar13° / 11610.10.511.73.7
Apr18° / 10°1389.8012.85.8
May22° / 15°15810.3013.86.6
Jun25° / 19°23413.9014.25.9
Jul29° / 23°25515.20144.8
Aug30° / 24°16914.4013.34.5
Sep27° / 21°18511.7012.26.1
Oct22° / 15°1168011.17.1
Nov16° / 727.2010.25.6
Dec11° / 606.70.39.83.0

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of October, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35248
45248
55446
65545
75644
85644
95842
105941
115941
126040
136040
146139
156139
166238
176238
186238
196238
206139
216238
226238
236238
246238
256238
266238
276238
286337
296337
306337
316238

Chance of precipitation in October

Any precipitation

Iwakuni gets around 116 mm of rain over 8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 26% and peaks near 32% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
431
531
630
730
829
929
1028
1128
1227
1327
1426
1526
1626
1725
1825
1925
2025
2124
2224
2324
2424
2523
2623
2723
2823
2923
3023
3123

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 49% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1162933166
2182933146
3193032135
4213131125
5233130114
6253229104
7273228104
830322693
933322483
1036312382
1138312172
1241311972
1344311861
1446311761
1548301551
1650301451
1753301340
1855291240
1958281130
2060271030
216127930
226426820
236525820
246824710
256923710
267022710
277221610
287419610
297618600
307717600
317916500

Wind in October

Winds average 9 km/h in October.

Across October, 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.

051015151015202531
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
319calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 42 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 6:10 AM to 6:36 AM, and sunset from 5:50 PM to 5:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:105:50
211.66:115:49
311.66:125:47
411.66:135:46
511.56:135:44
611.56:145:43
711.46:155:42
811.46:165:40
911.46:165:39
1011.36:175:38
1111.36:185:36
1211.36:195:35
1311.26:205:34
1411.26:215:33
1511.26:215:31
1611.16:225:30
1711.16:235:29
1811.16:245:28
1911.06:255:26
2011.06:265:25
2111.06:275:24
2210.96:275:23
2310.96:285:22
2410.96:295:21
2510.86:305:20
2610.86:315:19
2710.86:325:18
2810.76:335:17
2910.76:345:16
3010.76:355:15
3110.66:365:14

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.68 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.55 kWh/m² in May across the year — October's 3.68 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.4Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.3Moderate
313.3Moderate
Planning a trip in October

Hazard calendar for Iwakuni

In seasonPeak

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

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

Iwakuni'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 October a good time to visit Iwakuni?

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

7.1
Sightseeing
1st-best month of the year
4.8
Beach & pool
5th-best month of the year

October is one of the better times to visit Iwakuni for general sightseeing.

What to pack for Iwakuni in October

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

In October, Iwakuni sees daytime highs around 22°C and nights near 15°C. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Iwakuni in October

The nearest coast averages about 23°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 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 Iwakuni in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iwakuni peaks around July 11 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 highModerateJul 11UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Iwakuni in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Iwakuni 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 Iwakuni?

Iwakuni sits at 34.2°N, 132.2°E, 4 m above sea level, in Japan. The nearest listed city is Ōtake, 5.0 km away.

Topography around Iwakuni

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

Within 3 km, the terrain around Iwakuni has significant variations in elevation — a maximum elevation change of 272 m around an average of 29 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 644 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,336 m.

The land around Iwakuni is covered by artificial surfaces (50%) and trees (24%) within 3 km, trees (49%) and water (43%) within 16 km, and trees (55%) and water (38%) within 80 km.

3 km
272 m
16 km
644 m
80 km
1,336 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Ōtake 5.0 km · Ōno-hara 14 km · Miyajima 18 km · Hatsukaichi 23 km · Yanai 24 km · Etajima 25 km · Kure 33 km · Hiroshima 34 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 Iwakuni (34.163°, 132.22°, elevation 4 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).