Winters in Sisak are cool and unpredictable, with temperatures often fluctuating between freezing cold and mild. January is typically the coldest month, with average lows around 3°C and occasional drops below 0°C. As spring approaches, temperatures gradually warm up, with April and May experiencing a notable increase in warmth, reaching highs of up to 26°C and 28°C respectively. Summers are hot and dry, with July and August often seeing scorching temperatures above 35°C. Autumn brings a welcome respite from the heat, with September and October temperatures returning to more moderate levels, averaging around 11°C.