August in Spokane averages a daily high of 29°C with nights around 13.8°C. Expect roughly 3.3 wet days totalling 11.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Spokane is June–September.
Based on SPOKANE INTERNATIONAL AIRPORT, WA US (8.5km), 1995–2024. 30 years of August data.