There are a lot of people who know that Hawaii has a pleasant weather almost all year round. It should be noted though that it rains constantly in the area too. The only difference is that when you try to go around the state, the rain would be in certain spots.
Not all parts of the state would experience the rainfall. It can provide about 63.7 inches of rain year after year. There are some parts of the state that are rainier than others. You can always check this first before you can decide where in Hawaii you would actually choose to go. Some parts of Hawaii get a lot of rain but because the scenery is amazing, people do not mind anymore especially if they are going to swim anyway.