Sankt Augustin experiences a moderate climate with distinct seasons. Winters are cool and unpredictable, with temperatures often below freezing but occasionally rising into double digits. Spring arrives in March with mild temperatures, gradually warming up throughout the month, and continues into April with average highs around 20°C. Summers are warm but not hot, with July being the warmest month on average at 16°C. Autumn brings cooling temperatures again, with October and November experiencing similar weather to winter, before the cycle starts anew in December.