Weather in Tokyo in April

A good month. April works. It is not the peak, but nothing about it fights you. Highs average 18.2 °C, lows 8.8 °C, and rain falls on 11 days — nothing in the month is working against you.

April ranks 2 of 12 in Tokyo. Only May scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 11 days, 4 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 April reaches 30 °C. Across the twenty years measured, the hottest April day reached 26.7 °C and the coldest night fell to -0.5 °C, and the wettest single day dropped 79 mm — roughly 59% of the month's rain in one day.

April is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest April on record still delivered 235 mm against 59 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 135 mm average is a reasonable planning figure, not a promise.

Wind is light at 10.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 77%, high enough to notice on the warm days without dominating them.

How April sits in the year

The month is on the way up: 4.8 °C warmer than March, and May adds another 4.5 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

13.1 hours of daylight, gaining 1.1 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 19.1 °C in April — swimmable, but it takes a moment to commit. The sea peaks at 27.8 °C in August and bottoms out at 18 °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, September is the trade worth considering — 9 points weaker on weather, and materially quieter.

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

April in Tokyo versus nearby

If Tokyo is one option among several, the nearby comparison is worth making. Utsunomiya is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Hamamatsu is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: April is effectively as good as it gets here — 3 points behind May, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Tokyo

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