Matanzas River Mouth (St Augustine Inlet) UV IndexUnited StatesFLSt Johns CountyMatanzas River Mouth (St Augustine Inlet)1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAMatanzas River Mouth (St Augustine Inlet) UV forecast issued yesterday at 3:17 pm. Next forecast at approx. 3:17 pm.Get WillyWeather+ to remove ads