Iwakuni weather in July

In July, Iwakuni sees average daytime highs of 29°C and overnight lows near 23°C, with 255 mm of rain across 15.2 wet days and about 14 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 30°C by the end. The sky is clear or mostly clear about 19% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 14 h 18 min at the start of July to 13 h 42 min by month's end. Set against the rest of the year, July is Iwakuni's 11th-clearest and 9th-windiest month. For the whole year in context, see Iwakuni's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
23°
11th coldest
Rainfall
255 mm
15.2 wet days
Daylight
14 h 06 min
5:15 AM – 7:19 PM
Cloud cover
72%
11th clearest
Wind
8 km/h
9th windiest
Solar energy
5.07 kWh/m²
Travel score
4.8
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 July

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 27°C in the first days to 30°C by the end.

A typical July day in Iwakuni reaches about 29°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, July runs about 4°C warmer than June and about 1°C cooler than August.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12722
22722
32722
42722
52722
62722
72822
82823
92823
102823
112823
122823
132823
142923
152923
162923
172924
182924
192924
202924
213024
223024
233024
243024
253024
263024
273024
283025
293025
303025
313025

How July really feels in Iwakuni

Once humidity and wind are folded in, July averages 15 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
15
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Iwakuni weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 1st-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 12% of July, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21981
31981
42080
52080
62080
72179
82278
92377
102377
112575
122674
132773
142971
152971
163169
173169
183466
193565
203565
213862
223862
234060
244159
254258
264456
274555
284555
294753
304852
314852

Chance of precipitation in July

Any precipitation

Iwakuni gets around 255 mm of rain over 15.2 wet days in July, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 49% and peaks near 59% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
159
258
358
457
557
656
756
855
954
1053
1152
1251
1350
1449
1548
1647
1746
1845
1945
2044
2144
2243
2343
2443
2543
2643
2743
2843
2943
3043
3144

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the oppressive band about 65% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
111240461
211139481
311037511
41936522
50835552
60734572
70632593
80531613
90530614
100429634
110427645
120326665
130324676
140322696
150321697
160319708
170218719
180217729
1902167210
2002157211
2102147212
2202137213
2301127314
2401117315
2501117117
2601107118
270197119
280197020
290187021
300087022
310077023

Wind in July

Winds average 8 km/h in July.

Across July, 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.

051015151015202531
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
318calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 18 min at the start of July to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over July. Sunrise moves from 5:07 AM to 5:25 AM, and sunset from 7:22 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:077:22
214.25:077:22
314.25:087:22
414.25:087:22
514.25:097:22
614.25:097:22
714.25:107:22
814.25:107:21
914.25:117:21
1014.25:117:21
1114.25:127:21
1214.15:127:20
1314.15:137:20
1414.15:137:20
1514.15:147:19
1614.15:157:19
1714.15:157:18
1814.05:167:18
1914.05:167:18
2014.05:177:17
2114.05:187:16
2214.05:187:16
2313.95:197:15
2413.95:207:15
2513.95:217:14
2613.95:217:13
2713.85:227:13
2813.85:237:12
2913.85:237:11
3013.85:247:10
3113.75:257:10

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.07 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 — July's 5.07 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.6Bright
54.6Bright
64.6Bright
74.7Bright
84.7Bright
94.8Bright
104.8Bright
114.9Bright
124.9Bright
135.0Bright
145.0Bright
155.1Bright
165.1Bright
175.2Bright
185.2Bright
195.2Bright
205.3Bright
215.3Bright
225.3Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in July

Hazard calendar for Iwakuni

In seasonPeak

In July, 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 July a good time to visit Iwakuni?

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

4.8
Sightseeing
7th-best month of the year
5.9
Beach & pool
3rd-best month of the year

July is a reasonable time to visit Iwakuni for sightseeing.

What to pack for Iwakuni in July

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

In July, Iwakuni sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Iwakuni in July

The nearest coast averages about 24°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 10 (very high — sun protection essential). 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 July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July 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
July 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).