Cherry blossoms along Meguro River seem to have already reached the full bloom. You could enjoy them online here.
http://marzac7-nakameguro.comWe had snow this Wednesday. But cherry trees appear to grow rapidly after that. In my neighborhood, cherry blossoms were at 10% this Thursday, 30% yesterday, and now 50% today. I expect they will be in full bloom on the coming Monday. That is earlier than this forecast by WeatherNews issued yesterday. Theirs are the following.
Meguro River: Mar 24 (full bloom) - 29 (sakura blizzard)
Jingu Gaien: Mar 26 - Apr 1
Chidorigafuchi: Mar 27 - 31
Ueno Park: Mar 28 - Apr 1
Inokashira Park: Mar 30 - Apr 4
https://weathernews.jp/s/topics/201803/220085/Basically, sakura forecasts should be less accurate than weather forecasts. They use weather forecasts as a base for sakura predictions. I usually see weather forecasts both for a week and for ten days, but I decide what to do after I see a forecast on the day.
This is a current situation.
https://weathernews.jp/s/report/map/sakura.html?data=spotYou may check their predictions here.
http://weathernews.jp/sakura/#//ddm=simu_If you prefer English sites, I recommend these two.
https://n-kishou.com/corp/news-contents/sakura/news2018.html?lang=enhttps://sakura.weathermap.jp/en.php
With all the caveats above, the followings could be some clues. These results are collected by a sakura search tool.
Tokyo, Apr 7
7 hits:
https://weathernews.jp/s/sakura/search_result.html?area=TOKYO&mon=4&da...Hamarikyu: Mar 29 - Apr 6
https://weathernews.jp/s/sakura/spot/4425/index.htmlHikarigaoka Park: Mar 30 - Apr 6
https://weathernews.jp/s/sakura/spot/4412/index.htmlMusashino Park: Apr 1 - 6
https://weathernews.jp/s/sakura/spot/4421/index.htmlHamura: Apr 2 - 9
https://weathernews.jp/s/sakura/spot/111/index.htmlShowa Memorial Park: Apr 2 - 10
https://weathernews.jp/s/sakura/spot/4404/index.htmlSayama Park: Apr 4 - 10
https://weathernews.jp/s/sakura/spot/110/index.htmlKomine Park (Somei Yoshino): Apr 4 - 11
https://weathernews.jp/s/sakura/spot/4484/index.htmlTokyo SummerLand: Apr 4 - 11
https://weathernews.jp/s/sakura/spot/4487/index.htmlLake Okutama: Apr 9 - 15
https://weathernews.jp/s/sakura/spot/112/index.htmlKomine Park (Yamazakura): Apr 10 - 14
https://weathernews.jp/s/sakura/spot/113/index.htmlAlmost all are in West Tokyo.
Kyoto, Apr 11
6 hits:
https://weathernews.jp/s/sakura/search_result.html?area=KYOTO&mon=4&da...Heian Jingu: Apr 1 - 11
https://weathernews.jp/s/sakura/spot/295/index.htmlArashiyama: Apr 2 - 10
https://weathernews.jp/s/sakura/spot/301/index.htmlUji Bridge: Apr 2 - 10
https://weathernews.jp/s/sakura/spot/337/index.htmlKyoraku Park: Apr 4 - 10
https://weathernews.jp/s/sakura/spot/6101/index.htmlSanzenin: Apr 4 - 15
https://weathernews.jp/s/sakura/spot/6103/index.htmlNinnaji: Apr 7 - 10
https://weathernews.jp/s/sakura/spot/299/index.htmlSanzenin in North Kyoto would be the most promising.
Nikko
Nikko Kaido from Utsunomiya to Nikko is popular. Rinnoji has a later blooming tree.
Nikko Kaido: No forecast found. Mid-April is an average.
Rinnoji: Apr 23 - 27
http://weathernews.jp/sakura/pinpoint/?id=4108Yoshino is a whole mountain. They divide the area into four. This is an official forecast.
Shimosenbon: Apr 3
Nakasenbon: Apr 5
Kamisenbon: Apr 7
Okusenbon: Apr 12
https://www.town.yoshino.nara.jp/kanko-event/kanouki/kaika/And this is by a weather company.
Shimosenbon: Apr 8 - 13
http://weathernews.jp/sakura/pinpoint/?id=346Nakasenbon: Apr 10 - 14
http://weathernews.jp/sakura/pinpoint/?id=345Kamisenbon: Apr 11 - 14
http://weathernews.jp/sakura/pinpoint/?id=344Okusenbon: Apr 16 - 19
http://weathernews.jp/sakura/pinpoint/?id=6408In any case, you would be likely to enjoy sakura there.
Chureito is only popular among foreigners. I could not find any forecast site in Japanese.
Lake Kawaguchi: Apr 11 https://sp.jorudan.co.jp/hanami/spot_208.html
Cherry Blossom Festival might miss the full bloom entirely. But you might be able to encounter the full bloom there.
http://www.fujisan.ne.jp.e.aca.hp.transer.com/event/info.php?no=775Shibazakura could be much favorable, then:
http://www.shibazakura.jp/eng/