Intracoastal Waterway - Guana River UV IndexUnited StatesFLSt Johns CountyIntracoastal Waterway - Guana River1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAIntracoastal Waterway - Guana River UV forecast issued yesterday at 3:17 pm. Next forecast at approx. 3:17 pm.Get WillyWeather+ to remove ads