October in Hillsboro averages a daily high of 17.6°C with nights around 5.4°C. Expect roughly 14.4 wet days totalling 78.9mm. 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 October data.