August in Arvada averages a daily high of 30.4°C with nights around 12.7°C. Expect roughly 8.2 wet days totalling 38.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Arvada is May–June.
Based on WHEAT RIDGE 2, CO US (3.9km), 1995–2024. 29 years of August data.