Aliso Viejo's climate is mild, with slight variations throughout the year. Winters are cool, with temperatures ranging from around 2-30°C in January and February, making it a good time for outdoor activities like hiking. As spring approaches, temperatures gradually warm up, reaching highs of up to 34°C in April and May. Summers are warm but not hot, with July and August averaging around 25°C, while autumn brings a slight cooling trend, with October temperatures ranging from 9-34°C. In contrast, winters are cool again, with December temperatures dipping down to around 5-28°C.