Weather in Tokyo in August

Shoulder season. August sits in between. You will get good days and you will lose some. Highs average 31 °C, lows 23.6 °C, and rain falls on 13 days — nothing in the month is working against you.

August ranks 10 of 12 — near the bottom of Tokyo's year. May is the month that works, and the swing between the two is 26 points, which is a different holiday rather than a slightly better one.

Rain on 13 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31 °C days and 23.6 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 22 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 36.7 °C and the coldest night fell to 17.8 °C, and the wettest single day dropped 148 mm — roughly 110% of the month's rain in one day.

August is moderately variable: 22 mm in the driest year against 314 mm in the wettest, around an average of 134 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 8.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, 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

13.6 hours of daylight, losing 1 hours across the month. That is between Tokyo's extremes of 14.6 and 9.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 27.8 °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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

August in Tokyo versus nearby

If Tokyo is one option among several, the nearby comparison is worth making. Utsunomiya is the weaker option in August — within a degree on temperature, 4 days more rain. Hamamatsu is close enough to be a coin toss — 2.8 °C cooler, 3 days more rain.

So: August works, with May the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Tokyo

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