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The Hawai'i Climate Data Portal (HCDP) is designed to facilitate streamlined access to a wide variety of climate data and information for the State of Hawai'i. Prior to the development of the HCDP, gridded climate products and point datasets were fragmented, outdated, not easily accessible, and not available in near-real time. To address these limitations, HCDP researchers developed the cyberinfrastructure necessary to 1) operationalize data acquisition and product production in a near-real-time environment and 2) make data and products easily accessible to a wide range of users. The HCDP hosts several high-resolution (250 m) gridded products including monthly rainfall and daily temperature (maximum, minimum, and mean), station data, and gridded future projections of rainfall and temperature. HCDP users can visualize both gridded and point data, create and download custom maps, and query station and gridded data for export with relative ease. The 'virtual station' feature allows users to create a climate time series at any grid point. The primary objective of the HCDP is to promote sharing and access to data and information to streamline research activities, improve awareness, and promote the development of tools and resources that can help to build adaptive capacities. The HCDP products have the potential to serve a wide range of users including researchers, resource managers, city planners, engineers, teachers, students, civil society organizations, and the broader community. SIGNIFICANCE STATEMENT: The Hawai'i Climate Data Portal (HCDP) is an open-source data platform designed to provide easy access to climate data and information for the State of Hawai'i. The HCDP contains both station data and historical and future maps of rainfall and temperature. These high-resolution (250 m) maps are updated in near-real time and available for streamlined visualization and download. The HCDP fills a critical need for a centralized clearinghouse of climate data in the State of Hawai'i. HCDP data can be used to make resource management decisions and to raise awareness of observed and projected changes to the climate system. Many ongoing projects are leveraging HCDP data to develop models and decision support tools to improve adaptive capacities across the state. KEYWORDS: Rainfall; Climate; Temperature; Downscaling; Climate services, 1. Data portal purpose and design The effects of climate change, including higher temperatures (McKenzie et al. 2019), increased drought magnitude and duration (Frazier et al. 2022), decreases in rainfall [...]