April in Richland averages a daily high of 18.2°C with nights around 4.9°C. Expect roughly 6.5 wet days totalling 13.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Richland is May–June.
Based on RICHLAND, WA US (3.3km), 1995–2024. 28 years of April data.