September in Beaverton averages a daily high of 23.8°C with nights around 12.8°C. Expect roughly 6.9 wet days totalling 45.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Beaverton is July–September.
Based on PORTLAND KGW TV, OR US (9.6km), 1995–2024. 30 years of September data.