In situ sea surface salinity measurements from the tropical Pacific Ocean were used to derive monthly grids (1969-1995), and annual and monthly climatologies based on the 1979-1992 period. The source "bucket" data (1969-1998) and thermosalinograph data (1990-1999) from ships are also included in the dataset. These data along with moored buoy, hydrocast, and CTD-derived data were used to compute the gridded fields.