Winters in Simav are cold and variable, with temperatures often fluctuating between freezing and mild days. January is the coldest month, with average temperatures around 4°C, while February and December also experience chilly conditions. Spring brings a gradual warming trend, with April and May averaging highs above 20°C, marking the beginning of warm weather. Summers are hot and dry, with July and August consistently reaching averages above 26°C, while September sees a slight cooling. Autumn is mild to cool, with October and November temperatures ranging from around 10-20°C before dropping again in December.