October in Gresham averages a daily high of 17.9°C with nights around 8°C. Expect roughly 14.9 wet days totalling 98.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Gresham is June–September.
Based on PORTLAND TROUTDALE AIRPORT, OR US (6.1km), 1995–2024. 27 years of October data.