Bay St Louis - Bayou Portage Entrance UV IndexUnited StatesMSHarrison CountyBay St Louis - Bayou Portage Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAABay St Louis - Bayou Portage Entrance UV forecast issued today at 12:05 am. Next forecast at approx. 12:05 am.Get WillyWeather+ to remove ads