PacIOOS’ Regional Ocean Modeling System (ROMS) provides a 3-day, hourly forecast for the region surrounding the beaches of Waikīkī along the south shore of Oʻahu in the State of Hawaiʻi at approximately 40-m (131-ft) resolution. The forecast is run daily and gets updated on this website around 1:30 PM Hawaiʻi Standard Time (UTC-10) every afternoon. Outputs a current forecast, temperature forecast, and salinity forecast.