October in Portland averages a daily high of 15.4°C with nights around 4.9°C. Expect roughly 10.6 wet days totalling 141.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Portland is June–September.
Based on PORTLAND JETPORT, ME US (4km), 1995–2024. 30 years of October data.