San Justo, Argentina experiences a mild climate with distinct seasonal patterns. Winters are cool and relatively dry, with temperatures ranging from -3°C to 25°C in June and July. Spring arrives in September, bringing warmer temperatures, averaging around 15°C, and lingering into October. Summer months, December to February, are hot and sunny, with highs often reaching 40°C, while autumn brings a gradual cooling trend, with November's average high of 21°C marking the beginning of a more moderate climate.