April in Hillsboro averages a daily high of 15.9°C with nights around 3.9°C. Expect roughly 15.8 wet days totalling 62.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hillsboro is June–September.
Based on PORTLAND HILLSBORO AIRPORT, OR US (3.8km), 1995–2024. 26 years of April data.