Japan - weather in April

April is a spring month in Japan, and it is still quite cold in the north, and gradually milder as you go south. The rains are quite frequent everywhere.

The daily average temperature is 5/7 °C (41/45.5 °F) on the island of Hokkaido (see Abashiri, Sapporo), which is influenced by the Siberian currents, to the point that on the north coast, the sea temperature it is still around 0 °C (32 °F).
On the island of Honshu, the average is 9 °C (48 °F) in the far north (see Aomori), around 11 °C (52 °F) in the north, on both sides (see Niigata, Sendai), and around 15 °C (59 °F) on the southern coast (see Tokyo, Osaka). On the island of Kyushu, the average reaches up to 17.5 °C (63.5 °F) on the south coast (see Kagoshima).
On the small southern islands the temperature is much higher, as the average is 21.5 °C (70.5 °F) in Okinawa and 23.5 °C (74.5 °F) in Ishigaki.

As for the rains, as mentioned they are quite frequent everywhere, but they are more abundant in the south.

In the first half of April, the cherry blossom (hanami) takes place in central-northern Japan: the peak occurs around April 3 in several cities on the southern side of the island of Honshu (see Kobe, Kyoto, Okayama, Osaka), around April 7-8 in Kanazawa, and around April 13 in Niigata and Sendai.

In April, the sea is warm enough for swimming only on the small southernmost islands of Japan, namely Okinawa and even more so Miyakojima and Ishigaki, which are located just north of the Tropic of Cancer. However, the rains are frequent and the sun does not shine often.




See also: Japan, the weather in March - May
The climate of Japan