The datasets are the water temperature data for the MRB. Mainly for the main outlets for sub-basins. Include historical and future data. This dataset is associated with the following publication: Tang, C., and V. Garcia. Identifying stream temperature variation by coupling meteorological, hydrological, and water temperature models. JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION. American Water Resources Association, Middleburg, VA, USA, 59(4): 665-680, (2023).