Planning for the weather is a good way to make your trip to Siauliai relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 16°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Siauliai are January, February, December and November, with each month seeing an average of 34 cm of snowfall.