Weather in Fukuoka in August

A hard month. August is a hard month in Fukuoka, and worth planning around. The heat itself is manageable at 32.1 °C, but 84% humidity is what you will actually feel.

August ranks 12 of 12 — near the bottom of Fukuoka's year. October is the month that works, and the swing between the two is 42 points, which is a different holiday rather than a slightly better one.

This is wet-season rain: 16 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 84% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 25 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 36.8 °C and the coldest night fell to 16.9 °C, and the wettest single day dropped 134 mm — roughly 66% of the month's rain in one day.

August is moderately variable: 55 mm in the driest year against 491 mm in the wettest, around an average of 204 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 3.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How August sits in the year

This is a turning point in the year — July and September sit on opposite sides of it, so the month contains the change rather than following it.

Daylight in August

13.4 hours of daylight, losing 0.9 hours across the month. That is between Fukuoka'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 27.4 °C in August — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

August in Fukuoka versus nearby

If Fukuoka is one option among several, the nearby comparison is worth making. Kitakyushu is a better bet in August — 2.6 °C cooler, the same number of rain days. Hiroshima is a better bet in August — within a degree on temperature, 5 days less rain.

So: August is a compromise. October is 42 points better and is what Fukuoka is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Fukuoka

See all twelve months in Fukuoka, or where else to go in August.