Weather can make or break a road trip, so we've gathered some data about year-round temperatures in Viesīte to help you plan yours. 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 -3°C. The snowiest months in Viesīte are December, November, January and February, with each month seeing an average of 32 cm of snowfall.