https://www.jrailpass.com/blog/japan-cherry-blossom-forecast/
Cherry Blossom 2018 forecast by region
The estimated viewing dates are based on data collected in previous years, especially latest years 2016 and 2017, by the Japan Weather Association.
The 2018 sakura season is expected to be the same as normal in the central Japan and slightly later than usual in Shikoku and Kyushu (southern Japan).
The best times to visit (full bloom) werearound April 2nd in Tokyo, April 6th in Hiroshima, and April 7th in Kyoto and Osaka. Check again soon for updated information on your region of interest.
Also, please keep in mind that most flowers usually take a week to reach full bloom once blooming has started.
Fukuoka
Estimated best viewing dates: April 1 to April 7.
Blooming start: March 25.
Fuji Five Lakes
Estimated best viewing dates: March 31 to April 6.
Blooming start: March 25.
Fukushima
Estimated best viewing dates: April 8 to April 14.
Blooming start: April 6.
Hakodate (Hokkaido)
Estimated best viewing dates: April 29 to May 4
Blooming start: April 27
Hiroshima
Estimated best viewing dates: April 4 to April 10
Blooming start: March 27.
Kanazawa
Estimated best viewing dates: April 8 to April 14
Blooming start: April 5
Kobe
Estimated best viewing dates: April 7 to April 13
Blooming start: April 1
Kumamoto
Estimated best viewing dates: March 29 to April 5
Blooming start: March 24
KYOTO
Estimated best viewing dates: April 5 to April 11
Blooming start: March 31
Matsuyama (Ehime)
Estimated best viewing datess: April 1 to April 7
Blooming start: March 24
Nagano
Estimated best viewing dates: April 10 to April 16
Blooming start: April 8
Nagoya
Estimated best viewing dates: April 8 to April 14
Blooming start: April 5
Nara
Estimated best viewing dates: April 6 to April 12
Blooming start: April 3
OSAKA
Estimated best viewing dates: April 5 to April 11
Blooming start: April 1st
Sapporo
Estimated best viewing dates: May 2 to May 8
Blooming start: May 1
Sendai
Estimated best viewing dates: April 7 to April 13
Blooming start: April 7
TOKYO
Estimated best viewing dates: March 29 to April 4
Blooming start prediction: March 21
Yokohama
Estimated best viewing dates: April 3 to April 9
Blooming start prediction: March 25