Weather in Hiroshima in October

Prime time. October is about as good as Hiroshima gets. Highs average 22.8 °C, lows 13.1 °C, and rain falls on 10 days — nothing in the month is working against you.

October is the highest-scoring month of the twelve. The nearest rival is May, and the month at the other end of the year is January.

Rain on 10 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average October reaches 30 °C. Across the twenty years measured, the hottest October day reached 30.8 °C and the coldest night fell to 4.4 °C, and the wettest single day dropped 91 mm — roughly 81% of the month's rain in one day.

October is moderately variable: 23 mm in the driest year against 367 mm in the wettest, around an average of 113 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 7.2 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 October sits in the year

The month is on the way down: 5.3 °C cooler than September, with November dropping another 6 °C. The first week and the last are not the same trip.

Daylight in October

11.4 hours of daylight, losing 1 hours across the month. That is between Hiroshima's extremes of 14.4 and 9.9 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 22.4 °C in October — comfortable for a proper swim. 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

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, June is the trade worth considering — 13 points weaker on weather, and materially quieter.

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

October 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 — within a degree on temperature, 1 day less rain. Fukuoka is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: October is the answer for Hiroshima. If it is booked out or priced out, May is the next best thing at 3 points behind, and January is the month to keep off the shortlist.

Every month in Hiroshima

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