These data were compiled to evaluate the magnitude and direction of change from historical conditions in climate metrics across the Southwestern Utah Group (SEUG) of National Parks. Objective(s) of our study were to quantify the magnitude and direction of change from historical conditions in climate metrics across SEUG parks at a meaningful scale for land managers and practitioners. These data represent the historical and projected future average temperatures for two emission scenarios and 12 global circulation models. Included are the annual average temperatures and the average temperatures for each season. These data were created by sampling representative locations across each National Park unit and simulating daily variables using the SOILWAT2 ecosystem water-balance model. These data were created by a collaboration between the U.S. Geological Survey - Southwest Biological Science Center and the National Park Service SEUG to model the historical and projected future climate variables for each national park unit. These data can be used to evaluate future climate conditions in the SEUG National Park units for management actions.