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 temp of 61°F, while the coldest months are January and February with an average of 29°F. The snowiest months in Siauliai are January, February, December, and November, with each month seeing an average of 14 inches of snowfall.