Coral reef ecosystems are increasingly affected by climate-driven marine heatwaves, but the thermal environments experienced by corals at the reef-scale are still not well resolved by satellite-derived sea surface temperature (SST) products. <em>In situ</em> temperature loggers can capture much of this fine-scale variability, including diel temperature ranges, short-term extremes, and depth-dependent structure. However, these datasets are often fragmented across sources, inconsistently formatted, or not readily accessible for synthesis and reuse. To address these gaps, we developed the Coral Reef <em>In Situ</em> Product (CRISP), a global aggregation of temperature time series collected from coral reef environments. At the time of writing, CRISP includes 2,548 logger deployments assembled from a mix of public repositories, peer-reviewed literature, gray literature, and community contributions. Each deployment record is associated with available metadata fields stored in a consistent manner across all loggers. The entire dataset is provided in NetCDF format to support use in common scientific workflows (<em>e.g.</em>, MATLAB, Python, R). By bringing together these otherwise fragmented observations, CRISP enables analyses of fine-scale thermal variability across coral reef systems. The dataset adheres to the FAIR data principles by emphasizing findability, accessibility, interoperability, and reusability. CRISP can be used for a variety of scientific applications including coral bleaching research, thermal stress assessment, reef climate monitoring, model validation, and investigations of environmental variability across reef systems.