October in Portsmouth averages a daily high of 21.6°C with nights around 12.3°C. Expect roughly 8.2 wet days totalling 102.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Portsmouth is April–May.
Based on NORFOLK SOUTH, VA US (7.3km), 1995–2024. 22 years of October data.