Weather in Kitakyushu in September

A good month. September is a solid month to be in Kitakyushu. Highs average 26.4 °C, lows 22.4 °C, and rain falls on 14 days — nothing in the month is working against you.

September ranks 3 of 12 in Kitakyushu. Only October scores clearly higher, and the difference is small enough to be settled by price rather than weather.

This is wet-season rain: 14 wet days and 5 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. 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: the day barely swings — 4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 32.9 °C and the coldest night fell to 16.1 °C, and the wettest single day dropped 152 mm — roughly 76% of the month's rain in one day.

September is moderately variable: 62 mm in the driest year against 546 mm in the wettest, around an average of 200 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 14.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 3.1 °C cooler than August, with October dropping another 4.5 °C. The first week and the last are not the same trip. Rain is the thing that moves: October brings 5 days less of it, so pushing the dates later buys drier weather.

Daylight in September

12.4 hours of daylight, losing 1 hours across the month. That is between Kitakyushu'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 25.7 °C in September — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

September in Kitakyushu versus nearby

If Kitakyushu is one option among several, the nearby comparison is worth making. Fukuoka is the weaker option in September — within a degree on temperature, 1 day less rain. Hiroshima is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: September works, with October the better month by 10 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Kitakyushu

See all twelve months in Kitakyushu, or where else to go in September.