FPUS44 KLCH 240823 City Forecast for Beaumont Port Arthur, TX Issued Friday morning - May 24, 2013 .Friday... Partly cloudy, high 88, 20% chance of precipitation. .Friday night... Low 71, 10% chance of precipitation. .Saturday... Partly cloudy, high 87, 20% chance of precipitation. .Saturday night... Low 70. .Sunday... High 87.