 Ulaangom, Mongolia - September weather forecast and climate information Weather AtlasThe average high temperature in September: 17.3CThe average low temperature in September: 3.3CThe average rainfall in September: 13.4mmThe average rainfall days in September: 2.4 daysThe average sunshine in September: 8.3hWeather Atlas: Ulaangom, Mongolia - September weather forecast and climate information. Ulaangom, Mongolia - September weather averages including high and low temperatures, humidity, rainfall, snowfall, daylight, sunshine, UV index, and sea temperature. Country: Mongolia, City: Ulaangom. 1385371 