Weather will likely play an important role when you plan your trip to Omsk, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and June, with an average temperature of 17°C, while the coldest months are January and February, with an average of -13°C. The snowiest months in Omsk are March, December, November and February, with each month seeing an average of 40 cm of snowfall.