St. Matthew Island Swell ForecastUnited StatesAKBethel BoroughSt. Matthew Island1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISt. Matthew Island swell forecast issued yesterday at 8:48 pm. Next forecast at approx. 8:48 pm.Get WillyWeather+ to remove ads