It can be so hard to time the DC area's cherry blossom blooming period, especially when the weather gets a little crazy in the beginning of the year. There seem to be so many factors that play into when the flowers are at "peak bloom", and you really have to be flexible with planning on seeing them. One great resource is the DC Cherry Blossom Watch website, which is really helpful in seeing the most current conditions for the cherry blossoms.
That being said, if you are able to catch the cherry blossoms at the Tidal Basin (or various surrounding areas), it's really an amazing sight! I decided at the last minute on Monday after work to head over even though it had been cloudy and gloomy all day, since there looked to be rain in the forecast later on. I was very happy to see that a lot of the cherry blossoms had bloomed and there were lots of very pretty trees all around the Tidal Basin. And best of all, there were a lot less people than a usual weekend during this season, so it was a great chance to walk around the area and take a lot of photos. If you ever get a chance to see the cherry blossoms while they are in bloom, I highly recommend taking the time to check them out!