A few years back we cruised in the beginning of March, to and from L.A.
It was cold in LA, even had snow in the mountains.
The 1st seaday out was still cold, the 2nd was already better.
The 3rd days and thereafter were nice and warm.
More or less the same on the way back, the last 2 seadays were again getting more chilly. The sea was calm all the time.
For more weatherinformation check Weather Forecast & Reports - Long Range & Local | Wunderground | Weather Underground
You can find all weatherdetails of the past there.
Almost any day in Hawaii will have a little or more rain.