In March, the weather in Rogaška Slatina is typically cold. Average daily high temperature in March is about 9 degrees above zero. On average, Rogaška Slatina has 10 rainy, 9 partly cloudy, 6 sunny, and 6 cloudy days in March. The rains are usually moderate. March as well as January, February, April, and May is considered the most uncomfortable time to visit Rogaška Slatina.