FPUS44 KLCH 270907 City Forecast for Beaumont Port Arthur, TX Issued Friday morning - Dec 27, 2013 .Friday... Mostly cloudy, high 58, 5% chance of precipitation. .Friday night... Low 41, 10% chance of precipitation. .Saturday... Mostly cloudy, high 56, 20% chance of precipitation. .Saturday night... Low 39. .Sunday... High 62.