June in Castle Rock averages a daily high of 27.1°C with nights around 10.4°C. Expect roughly 7.7 wet days totalling 55.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Castle Rock is May–June.
Based on CASTLE ROCK, CO US (1.7km), 1995–2024. 28 years of June data.