Weather in Hiroshima in June

A good month. June works. It is not the peak, but nothing about it fights you. The heat itself is manageable at 27.4 °C, but 82% humidity is what you will actually feel.

June ranks 5 of 12 in Hiroshima: past the worst of the year but short of October, which is the month to book if the dates are open.

This is wet-season rain: 13 wet days and 6 genuinely heavy ones, which in this climate means concentrated downpours rather than all-day grey. The pattern is usually a clear morning and a loud afternoon, so front-load the day and stop fighting the 3pm hour. Natural fibres and a second shirt for the day. At 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 4 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest June day reached 34.9 °C and the coldest night fell to 10.5 °C, and the wettest single day dropped 102 mm — roughly 48% of the month's rain in one day.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 451 mm against 41 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 211 mm average is a reasonable planning figure, not a promise.

Wind is light at 6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How June sits in the year

The month is on the way up: 3.4 °C warmer than May, and July adds another 3.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in June

June is at or near the longest days of Hiroshima's year: 14.4 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 20.6 °C in June — swimmable, but it takes a moment to commit. The sea peaks at 26.9 °C in August and bottoms out at 12.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself. June is the value pick for Hiroshima: it scores within 13 points of October without carrying October's prices.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Hiroshima versus nearby

If Hiroshima is one option among several, the nearby comparison is worth making. Kitakyushu is close enough to be a coin toss — 3.1 °C cooler, 2 days more rain. Fukuoka is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: June works, with October the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Hiroshima

See all twelve months in Hiroshima, or where else to go in June.