In October, Portsmouth typically sees daytime highs of 14.2°C and overnight lows around 7.8°C. Compared to the annual average high of 13.2°C, October runs +1.0°C.
October in Portsmouth averages a daytime high of 14.2°C and an overnight low of 7.8°C.
October runs +1.0°C compared to Portsmouth's annual average high of 13.2°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 14.2°C and cooler evenings around 7.8°C.