If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Marijampole: The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and February with an average of 30°F. The snowiest months in Marijampole are January, December, February, and November, with each month seeing an average of 10 inches of snowfall.