AI-generatedIwakuni at a glance
- Best time
- Jul – Oct
- Warmest month
- Aug · 33°
- Warmest sea
- Aug · 26.5°
- Sunshine a year
- 2,040 h
- Rain a year
- 1,520 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 4 m
Climate in Iwakuni
Iwakuni has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 33 °C, while January is the coolest at 10 °C. With around 2,040 hours of sunshine a year, Iwakuni is moderately sunny; May is the sunniest month with 6.8 hours a day.
Holiday weather through the year
Best time to visit Iwakuni
The best time to visit Iwakuni is from July to October. In August, September and October, though, the typhoon season is at its peak: check the forecast before you go. For a beach holiday – sea from 21 °C, warm and mostly dry – go from August to October. For sightseeing, day trips and hiking, conditions are most comfortable from April to May and from October to November. In August it can get very hot, with highs of up to 33 °C. The wettest month is June with 222 mm of precipitation.
Iwakuni through the seasons
How the weather changes over the seasons, with averages for each.
Iwakuni in spring
Mar – May
Poor
- 15–25 °C by day
- Sea 15 °C
- 6.3 h of sun a day
- 30 rainy days in all
Iwakuni in summer
Jun – Aug
Good
- 28–33 °C by day
- Sea 24 °C
- 5.9 h of sun a day
- 37 rainy days in all
Iwakuni in autumn
Sep – Nov
Good
- 18–29 °C by day
- Sea 23 °C
- 5.5 h of sun a day
- 26 rainy days in all
Iwakuni in winter
Dec – Feb
Poor
- 10–12 °C by day
- Sea 15 °C
- 4.7 h of sun a day
- 21 rainy days in all
Which month for what?
Beach & swimming
Aug – Oct
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – May, Oct – Nov
15–28 °C and not too much rain
Peak heat
Aug
Highs of 33 °C or more
Rainy months
Jun
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in Iwakuni for you.
Your best months: September
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Good
Best time to visit: July – October
October is the peak of the typhoon season Hurricane season
Where to go in OctoberSea temperature in October
Good forBeach & swimmingSightseeing & walks
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 18°
- Midday, 13:00: about 24°
- Afternoon, 16:00: about 23°
- Evening, 20:00: about 19°
- Night, 23:00: about 17°
06:1517:38
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:00–06:49 · evening 17:05–17:54
- Blue hour
- Morning 05:50–06:00 · evening 17:54–18:04
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Iwakuni compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 26° at the start of the month to 21° at the end. The sea cools from 24° to 22°. The days get 1.0 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 26° | 21° |
| Night-time low | 17° | 11° |
| Sea | 24° | 22° |
| Daylight | 11.9 h | 10.9 h |
What is the weather like in Iwakuni in October?
In October, Iwakuni is warm: daytime highs average 24 °C, and nights cool down to about 15 °C. The sea averages 23.3 °C – pleasant for swimming. Expect around 5.8 hours of sunshine a day. Rain falls on about 8 days, adding up to 111 mm. All in all, October is a good month for a holiday in Iwakuni.
More details for October
- Daylight
- 11 h 23 min06:15 – 17:38
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9offset from UTC
How the score comes together
- Temperatureweight 35 %78 %
- Seaweight 25 %90 %
- Sunshineweight 20 %47 %
- Few rainy daysweight 20 %71 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Swimwear
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Compare two months in Iwakuni
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
September has the better holiday weather in Iwakuni: score 78 against 73. In September, days are 5 °C warmer than in October. The sea is 2 °C warmer in September. September has 3 more rainy days.
| Month | October | September |
|---|---|---|
| Holiday weather score | 73 | 78better |
| Daytime high | 24° | 29° |
| Night-time low | 15° | 21° |
| Sea | 23.3° | 25.5° |
| Sunshine | 5.8 h | 5.6 h |
| Rainy days | 8better | 11 |
| Rainfall | 111 mmbetter | 168 mm |
| Muggy days | 4better | 22 |
Based on the climate averages 1996–2025.
Iwakuni month by month
The typical weather for every month at a glance.
22January10° · Sea 14° · 4.5 h
In January, Iwakuni is cold: daytime highs average 10 °C, and nights cool down to about 1 °C. The sea averages 14.1 °C – swimming is only for the hardy. Expect around 4.5 hours of sunshine a day. Rain falls on about 6 days, adding up to 51 mm. All in all, January is not an ideal month for a holiday in Iwakuni.
Iwakuni in January21February11° · Sea 13° · 5.0 h
In February, Iwakuni is cool: daytime highs average 11 °C, and nights cool down to about 2 °C. The sea averages 12.5 °C – swimming is only for the hardy. Expect around 5.0 hours of sunshine a day. Rain falls on about 8 days, adding up to 72 mm. All in all, February is not an ideal month for a holiday in Iwakuni.
Iwakuni in February21March15° · Sea 13° · 5.7 h
In March, Iwakuni is cool: daytime highs average 15 °C, and nights cool down to about 5 °C. The sea averages 12.6 °C – swimming is only for the hardy. Expect around 5.7 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 118 mm in total. All in all, March is not an ideal month for a holiday in Iwakuni.
Iwakuni in March31April20° · Sea 14° · 6.5 h
In April, Iwakuni is mild: daytime highs average 20 °C, and nights cool down to about 10 °C. The sea averages 14.2 °C – swimming is only for the hardy. The sun shines for around 6.5 hours a day. Rain is frequent, with about 10 rainy days and 137 mm in total. All in all, April is not an ideal month for a holiday in Iwakuni.
Iwakuni in April59May25° · Sea 17° · 6.8 h
In May, Iwakuni is warm: daytime highs average 25 °C, and nights cool down to about 15 °C. The sea averages 16.9 °C – swimming is only for the hardy. The sun shines for around 6.8 hours a day. Rain is frequent, with about 10 rainy days and 161 mm in total. All in all, May is a so-so month for a holiday in Iwakuni.
Iwakuni in May62June28° · Sea 20° · 5.3 h
In June, Iwakuni is hot: daytime highs average 28 °C, and even at night it stays warm at around 20 °C. The sea averages 20.4 °C – refreshing for a swim. Expect around 5.3 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 222 mm in total. The air is often humid and muggy. All in all, June is a good month for a holiday in Iwakuni.
Iwakuni in June74July31° · Sea 24° · 5.6 h
In July, Iwakuni is hot: daytime highs average 31 °C, and even at night it stays warm at around 24 °C. The sea averages 24.2 °C – pleasant for swimming. Expect around 5.6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 210 mm in total. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a good month for a holiday in Iwakuni.
Iwakuni in July72August33° · Sea 27° · 6.7 h
In August, Iwakuni is very hot: daytime highs average 33 °C, and even at night it stays warm at around 25 °C. The sea averages 26.5 °C – lovely and warm for swimming. The sun shines for around 6.7 hours a day. Rain is frequent, with about 11 rainy days and 139 mm in total. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a good month for a holiday in Iwakuni.
Iwakuni in August78September29° · Sea 26° · 5.6 h
In September, Iwakuni is hot: daytime highs average 29 °C, and even at night it stays warm at around 21 °C. The sea averages 25.5 °C – pleasant for swimming. Expect around 5.6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 168 mm in total. On about 12 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Iwakuni.
Iwakuni in September73October24° · Sea 23° · 5.8 h
In October, Iwakuni is warm: daytime highs average 24 °C, and nights cool down to about 15 °C. The sea averages 23.3 °C – pleasant for swimming. Expect around 5.8 hours of sunshine a day. Rain falls on about 8 days, adding up to 111 mm. All in all, October is a good month for a holiday in Iwakuni.
Iwakuni in October35November18° · Sea 20° · 5.1 h
In November, Iwakuni is mild: daytime highs average 18 °C, and nights cool down to about 8 °C. The sea averages 20.4 °C – refreshing for a swim. Expect around 5.1 hours of sunshine a day. Rain falls on about 7 days, adding up to 75 mm. All in all, November is not an ideal month for a holiday in Iwakuni.
Iwakuni in November21December12° · Sea 17° · 4.5 h
In December, Iwakuni is cool: daytime highs average 12 °C, and nights cool down to about 3 °C. The sea averages 16.9 °C – swimming is only for the hardy. Expect around 4.5 hours of sunshine a day. Rain falls on about 7 days, adding up to 58 mm. All in all, December is not an ideal month for a holiday in Iwakuni.
Iwakuni in DecemberClimate in detail
Year & climate table
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Iwakuni
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (15+ muggy days)
PleasantOctober: nights around 15°. Ideal for sleeping, often with the window open. Muggy on about 4 days (dew point 18 °C or more).
The coolest nights are in January (1°), the warmest in August (25°). Tropical nights of 20 °C and more are the rule from June to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in May and in October. Nights fall below 8 °C on average from December to March, so the room should be heated. It is muggy (dew point 18 °C or more) on about 106 days a year, mostly from June to September.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 22 | 10° | 1° | 14.1° | 4.5 h | 6 | 51 |
| FebruaryFeb | 21 | 11° | 2° | 12.5° | 5.0 h | 8 | 72 |
| MarchMar | 21 | 15° | 5° | 12.6° | 5.7 h | 10 | 118 |
| AprilApr | 31 | 20° | 10° | 14.2° | 6.5 h | 10 | 137 |
| MayMay | 59 | 25° | 15° | 16.9° | 6.8 h | 10 | 161 |
| JuneJun | 62 | 28° | 20° | 20.4° | 5.3 h | 13 | 222 |
| JulyJul | 74 | 31° | 24° | 24.2° | 5.6 h | 13 | 210 |
| AugustAug | 72 | 33° | 25° | 26.5° | 6.7 h | 11 | 139 |
| SeptemberSep | 78 | 29° | 21° | 25.5° | 5.6 h | 11 | 168 |
| OctoberOct | 73 | 24° | 15° | 23.3° | 5.8 h | 8 | 111 |
| NovemberNov | 35 | 18° | 8° | 20.4° | 5.1 h | 7 | 75 |
| DecemberDec | 21 | 12° | 3° | 16.9° | 4.5 h | 7 | 58 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
34.16° N, 132.22° E · 4 m · Asia/Tokyo
Sea temperature
Sea temperature in Iwakuni
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 22.5 – 23.9 °C
Swimming season: Jun – Nov
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Iwakuni ranges from 12.5 °C in February to 26.5 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to November.
From November to February the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 25.0 and 27.7 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 14.1° | 12.2° | 16.1° | cold |
| FebruaryFeb | 12.5° | 10.7° | 15.2° | cold |
| MarchMar | 12.6° | 10.6° | 15.7° | cold |
| AprilApr | 14.2° | 12.2° | 16.7° | cold |
| MayMay | 16.9° | 15.3° | 18.3° | cold |
| JuneJun | 20.4° | 19.3° | 21.6° | refreshing |
| JulyJul | 24.2° | 22.8° | 25.7° | pleasant |
| AugustAug | 26.5° | 25.0° | 27.7° | warm |
| SeptemberSep | 25.5° | 24.4° | 26.6° | pleasant |
| OctoberOct | 23.3° | 22.5° | 23.9° | pleasant |
| NovemberNov | 20.4° | 19.9° | 20.9° | refreshing |
| DecemberDec | 16.9° | 15.5° | 17.6° | cold |
Sunshine
Sunshine hours in Iwakuni
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.8 of 11.4 hours of daylight in Iwakuni, 51 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain
Rain in Iwakuni: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Iwakuni has about 8 rainy days with 111 mm of rain in total.
UV index
UV index in Iwakuni
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 5 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 11).
Minutes until sunburn in October
- Very fair skin
- about 25 min
- Fair skin
- about 30 min
- Light brown skin
- about 45 min
- Olive skin
- about 55 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind & clouds
Wind and clouds in Iwakuni
How breezy and how cloudy Iwakuni is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Iwakuni typically peaks at 19 km/h during the day: Beaufort 3, gentle breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Dec – Mar.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 49 % of the sky over Iwakuni: variable cloud, with about 5.8 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat & humidity
Heat and humidity in Iwakuni
How often the day gets hot in Iwakuni (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Iwakuni has about 0 hot days, with an average daytime high of 24 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Planning a trip to Iwakuni
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Iwakuni in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Iwakuni has its best school-holiday weather during the summer holidays (score 73) and its weakest during the Christmas holidays (score 22).
- 28
Easter holidays
Mar – Apr
Poor
- 19 °C by day
- Sea 14 °C
- 6.3 h of sun a day
- 10 rainy days a month
- 60
May half-term
May – Jun
Good
- 25 °C by day
- Sea 18 °C
- 6.5 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 73
Summer holidays
Jul – Aug
GoodBest holidays
- 32 °C by day
- Sea 26 °C
- 6.3 h of sun a day
- 12 rainy days a month
Keep in mind: Peak heat, Storm season
- 73
October half-term
Oct
Good
- 24 °C by day
- Sea 23 °C
- 5.8 h of sun a day
- 8 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
Keep in mind: Storm season
- 22
Christmas holidays
Dec – Jan
Poor
- 11 °C by day
- Sea 16 °C
- 4.5 h of sun a day
- 6 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 11 h 50 min
- Distance
- 9,430 km
- Time zone
- UTC+9
- Jet lag
- About 8 days (8 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Good to know: Japan
- Currency
- Japanese Yen (JPY)
- Language
- Japanese
- Sockets
- Type A, B · 100 V
- Traffic
- Drives on the left
- Dialling code
- +81
UK plugs need a travel adapter
Only 100 V: chargers marked 100–240 V work, other devices need a voltage converter.
Sources: GeoNames (CC BY 4.0) and Wikidata (CC0). Please check details before you travel.
Storm season
Iwakuni lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM, Fiji Meteorological Service); not a forecast.
Compare & alternatives
Compare with another place
Iwakuni compared
Put Iwakuni side by side with another destination.
Iwakuni vs Itsukushima
In October the holiday weather in Iwakuni and Itsukushima is about equally good (score 73 vs 75). During the day it is about as warm in Itsukushima as in Iwakuni. The sea is about equally warm.
| in October | Iwakuni | Itsukushima |
|---|---|---|
| Holiday weather score | 73 | 75 |
| Daytime high | 24° | 24° |
| Sea | 23° | 23° |
| Sunshine | 6 h | 6 h |
| Rainy days | 8 | 8 |
| Best time | Jul – Oct | Jul – Oct |
Through the year
Best places in the country
Japan in October: the best places
In October, Iwakuni ranks 23 among the 31 nearest destinations in this country.
- Sasebo24°24°82
- 2Kure23°23°81
- 3Hiroshima24°23°81
- 4Fukuoka24°23°81
- 5Nagasaki24°24°81
- 6Yamaguchi23°80
- 7Shimonoseki24°23°80
- 8Kumamoto24°23°80
- 23IwakuniThis page24°23°73
Places nearby
Near Iwakuni
Other destinations close by.
Places with a similar climate
Places with a climate like Iwakuni
Destinations whose weather through the year is closest to Iwakuni's – good alternatives.
Frequently asked questions about Iwakuni
When is the best time to visit Iwakuni?
The best time to visit Iwakuni is from July to October. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Iwakuni?
The sea temperature in Iwakuni ranges from 12.5 °C in February to 26.5 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to November.
Can you swim in Iwakuni in October?
Yes. In October the sea averages 23.3 °C – pleasant for swimming.
What is the warmest month in Iwakuni?
August is the warmest month, with average highs of 33 °C and nights around 25 °C. January is the coolest month at 10 °C.
When does it rain most in Iwakuni?
The wettest month is June with 222 mm of precipitation. The driest month is January with 51 mm.
How many hours of sunshine does Iwakuni get?
Iwakuni gets around 2,040 hours of sunshine a year. The sunniest month is May with 6.8 hours a day; in January there are 4.5 hours a day.
What time zone is Iwakuni in?
Iwakuni is on UTC+9 all year.
How long is the flight from London to Iwakuni?
A nonstop flight from London to Iwakuni takes about 11 h 50 min, for a straight-line distance of about 9,430 km. Most routes need a change of planes, which adds time.
When is typhoon season in Iwakuni?
Iwakuni lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Iwakuni?
Iwakuni has its best school-holiday weather during the summer holidays (score 73) and its weakest during the Christmas holidays (score 22). Holiday ratings (0–100): Easter holidays 28, May half-term 60, summer holidays 73, October half-term 73, Christmas holidays 22.