Weather will likely play an important role when you plan your trip to Lons-le-Saunier, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of 4°C. Average annual precipitation for Lons-le-Saunier is 1192 mm.