AI-generatedHiroshima at a glance
- Best time
- Apr – Jul, Sep – Nov
- Warmest month
- Aug · 29°
- Warmest sea
- Aug · 26.5°
- Sunshine a year
- 2,040 h
- Rain a year
- 1,520 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 16 m
Climate in Hiroshima
Hiroshima has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 29 °C, while January is the coolest at 9 °C. With around 2,040 hours of sunshine a year, Hiroshima is moderately sunny; May is the sunniest month with 6.8 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: April – July, September – November
October is the peak of the typhoon season
Good forSightseeing & walks
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 19°
- Midday, 13:00: about 22°
- Afternoon, 16:00: about 21°
- Evening, 20:00: about 19°
- Night, 23:00: about 18°
06:1417:37
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 05:59–06:48 · evening 17:03–17:53
- Blue hour
- Morning 05:49–05:59 · evening 17:53–18:02
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.
What is the weather like in Hiroshima in October?
In October, Hiroshima is warm: daytime highs average 22 °C, and nights cool down to about 17 °C. The sea averages 23.3 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 111 mm. All in all, October is an excellent month for a holiday in Hiroshima.
More details for October
- Daylight
- 11 h 23 min06:14 – 17:37
- 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+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %47 %
- Few rainy daysweight 30 %71 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- Rain jacket or umbrella
Sea temperature in Hiroshima
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 Hiroshima 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 October 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 hours in Hiroshima
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 Hiroshima, 51 % of the day.
Sunshine hours: measured at the weather station 1 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Hiroshima
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 it, 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.
Rain in Hiroshima: 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, Hiroshima has about 8 rainy days with 111 mm of rain in total.
Wind and clouds in Hiroshima
How breezy and how cloudy Hiroshima 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 Hiroshima typically peaks at 19 km/h during the day: Beaufort 3, light 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 Hiroshima: 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 and humidity in Hiroshima
How often the day gets hot in Hiroshima (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, Hiroshima has about 0 hot days, with an average daytime high of 22 °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
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Hiroshima
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 (10+ muggy days)
PleasantOctober: nights around 17°. 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 (4°), 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 104 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 | 35 | 9° | 4° | 14.1° | 4.5 h | 6 | 51 |
| FebruaryFeb | 36 | 10° | 4° | 12.5° | 5.0 h | 8 | 72 |
| MarchMar | 50 | 13° | 7° | 12.6° | 5.7 h | 10 | 118 |
| AprilApr | 72 | 17° | 11° | 14.2° | 6.4 h | 10 | 137 |
| MayMay | 80 | 21° | 15° | 16.9° | 6.8 h | 10 | 161 |
| JuneJun | 68 | 24° | 20° | 20.4° | 5.2 h | 13 | 222 |
| JulyJul | 66 | 28° | 24° | 24.2° | 5.6 h | 13 | 210 |
| AugustAug | 63 | 29° | 25° | 26.5° | 6.7 h | 11 | 139 |
| SeptemberSep | 73 | 26° | 22° | 25.5° | 5.6 h | 11 | 168 |
| OctoberOct | 81 | 22° | 17° | 23.3° | 5.8 h | 8 | 111 |
| NovemberNov | 74 | 17° | 12° | 20.4° | 5.1 h | 7 | 75 |
| DecemberDec | 45 | 11° | 6° | 16.9° | 4.5 h | 7 | 58 |
Climate averages 1996–2025, 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
34.40° N, 132.45° E · 16 m · Asia/Tokyo
Best time to visit Hiroshima
The best time to visit Hiroshima is from April to July and from September to November. For a beach holiday with the sea above 21 °C, go from August to September. For sightseeing, day trips and hiking, conditions are most comfortable from April to May and from September to November. Rain is most frequent from June to July; the wettest month is June with 222 mm.
Hiroshima through the seasons
How the weather changes over the seasons, with averages for each.
Hiroshima in spring
Mar – May
Good
- 13–21 °C by day
- Sea 15 °C
- 6 h of sun a day
- 30 rainy days in all
Hiroshima in summer
Jun – Aug
Good
- 24–29 °C by day
- Sea 24 °C
- 6 h of sun a day
- 37 rainy days in all
Hiroshima in autumn
Sep – Nov
Good
- 17–26 °C by day
- Sea 23 °C
- 6 h of sun a day
- 26 rainy days in all
Hiroshima in winter
Dec – Feb
Poor
- 9–11 °C by day
- Sea 15 °C
- 5 h of sun a day
- 21 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Hiroshima for you.
Your best months: May – June, October
Based on the climate averages; tap a month to see its details.
Compare two months in Hiroshima
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
October and May bring similar holiday weather to Hiroshima (score 81 and 80). In May, days are 1 °C cooler than in October. The sea is 6 °C cooler in May. May has 2 more rainy days. The sun shines an hour longer a day in May.
| Month | October | May |
|---|---|---|
| Weather score | 81 | 80 |
| Day high | 22° | 21° |
| Night low | 17° | 15° |
| Sea | 23.3° | 16.9° |
| Sunshine | 5.8 h | 6.8 hbetter |
| Rainy days | 8better | 10 |
| Rainfall | 111 mmbetter | 161 mm |
| Muggy days | 4 | 1better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Aug – Sep
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – May, Sep – Nov
15–28 °C and not too much rain
Rainy months
Jun – Jul
12 or more rainy days
Hiroshima month by month
The typical weather for every month at a glance.
35January9° · Sea 14° · 5 h
In January, Hiroshima is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sea averages 14.1 °C – swimming is only for the hardy. Expect around 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 Hiroshima.
Hiroshima in January36February10° · Sea 13° · 5 h
In February, Hiroshima is cold: daytime highs average 10 °C, and nights cool down to about 4 °C. The sea averages 12.5 °C – swimming is only for the hardy. Expect around 5 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 Hiroshima.
Hiroshima in February50March13° · Sea 13° · 6 h
In March, Hiroshima is cool: daytime highs average 13 °C, and nights cool down to about 7 °C. The sea averages 12.6 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 118 mm in total. All in all, March is a so-so month for a holiday in Hiroshima.
Hiroshima in March72April17° · Sea 14° · 6 h
In April, Hiroshima is mild: daytime highs average 17 °C, and nights cool down to about 11 °C. The sea averages 14.2 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 137 mm in total. All in all, April is a good month for a holiday in Hiroshima.
Hiroshima in April80May21° · Sea 17° · 7 h
In May, Hiroshima is mild: daytime highs average 21 °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 7 hours a day. Rain is frequent, with about 10 rainy days and 161 mm in total. All in all, May is an excellent month for a holiday in Hiroshima.
Hiroshima in May68June24° · Sea 20° · 5 h
In June, Hiroshima is warm: daytime highs average 24 °C, and nights cool down to about 20 °C. The sea averages 20.4 °C – refreshing for a swim. Expect around 5 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 Hiroshima.
Hiroshima in June66July28° · Sea 24° · 6 h
In July, Hiroshima is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °C. The sea averages 24.2 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 210 mm in total. The air is often humid and muggy. All in all, July is a good month for a holiday in Hiroshima.
Hiroshima in July63August29° · Sea 27° · 7 h
In August, Hiroshima is hot: daytime highs average 29 °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 7 hours a day. Rain is frequent, with about 11 rainy days and 139 mm in total. On about 11 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 Hiroshima.
Hiroshima in August73September26° · Sea 26° · 6 h
In September, Hiroshima is warm: daytime highs average 26 °C, and even at night it stays warm at around 22 °C. The sea averages 25.5 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 168 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Hiroshima.
Hiroshima in September81October22° · Sea 23° · 6 h
In October, Hiroshima is warm: daytime highs average 22 °C, and nights cool down to about 17 °C. The sea averages 23.3 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 111 mm. All in all, October is an excellent month for a holiday in Hiroshima.
Hiroshima in October74November17° · Sea 20° · 5 h
In November, Hiroshima is mild: daytime highs average 17 °C, and nights cool down to about 12 °C. The sea averages 20.4 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. Rain falls on about 7 days, adding up to 75 mm. All in all, November is a good month for a holiday in Hiroshima.
Hiroshima in November45December11° · Sea 17° · 5 h
In December, Hiroshima is cool: daytime highs average 11 °C, and nights cool down to about 6 °C. The sea averages 16.9 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain falls on about 7 days, adding up to 58 mm. All in all, December is a so-so month for a holiday in Hiroshima.
Hiroshima in DecemberHiroshima compared
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Hiroshima vs. Itsukushima
In October the holiday weather in Hiroshima and Itsukushima is about equally good (score 81 vs. 81). During the day it is about as warm in Itsukushima as in Hiroshima. The sea is about equally warm.
| in October | Hiroshima | Itsukushima |
|---|---|---|
| Holiday score | 81 | 81 |
| Daytime high | 22° | 22° |
| Sea | 23° | 23° |
| Sunshine | 6 h | 6 h |
| Rainy days | 8 | 8 |
| Best time | Apr – Jul, Sep – Nov | Jul – Sep |
Through the year
Japan in October: the best places
In October, Hiroshima ranks 1 among the 31 nearest destinations in this country.
- HiroshimaThis page22°23°81
- 2Fukuoka22°23°81
- 3Nagasaki23°24°81
- 4Kumamoto23°23°80
- 5Kitakyūshū22°23°79
- 6Okayama22°24°78
- 7Kagoshima24°26°77
- 8Okinawa26°27°77
Planning a trip to Hiroshima
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Hiroshima 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.
Hiroshima has its best school-holiday weather during October half-term (score 81) and its weakest during the Christmas holidays (score 40).
- 65
Easter holidays
Mar – Apr
Good
- 16 °C by day
- Sea 14 °C
- 6.2 h of sun a day
- 10 rainy days a month
- 78
May half-term
May – Jun
Good
- 21 °C by day
- Sea 18 °C
- 6.5 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 64
Summer holidays
Jul – Aug
Good
- 29 °C by day
- Sea 26 °C
- 6.3 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain, Storm season
- 81
October half-term
Oct
ExcellentBest holidays
- 22 °C by day
- Sea 23 °C
- 5.8 h of sun a day
- 8 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 40
Christmas holidays
Dec – Jan
Fair
- 10 °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
- 9,420 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.
Storm season
Hiroshima 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); not a forecast.
Frequently asked questions about Hiroshima
When is the best time to visit Hiroshima?
The best time to visit Hiroshima is from April to July and from September to November. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Hiroshima?
The sea temperature in Hiroshima 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 Hiroshima in October?
Yes. In October the sea averages 23.3 °C – pleasant for swimming.
What is the warmest month in Hiroshima?
August is the warmest month, with average highs of 29 °C and nights around 25 °C. January is the coolest month at 9 °C.
When does it rain most in Hiroshima?
Rain is most frequent from June to July; the wettest month is June with 222 mm. The driest month is January with 51 mm.
How many hours of sunshine does Hiroshima get?
Hiroshima 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 Hiroshima in?
Hiroshima uses the time zone Asia/Tokyo, at UTC+9 all year.
How long is the flight from London to Hiroshima?
A nonstop flight from London to Hiroshima takes about 11 h 50 min, for a straight-line distance of about 9,420 km. Most routes need a change of planes, which adds time.
When is typhoon season in Hiroshima?
Hiroshima 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 Hiroshima?
Hiroshima has its best school-holiday weather during October half-term (score 81) and its weakest during the Christmas holidays (score 40). Holiday ratings (0–100): Easter holidays 65, May half-term 78, Summer holidays 64, October half-term 81, Christmas holidays 40.
Near Hiroshima
Other destinations close by.
Places with a climate like Hiroshima
Destinations whose weather through the year is closest to Hiroshima's – good alternatives.