In July, Portsmouth typically sees daytime highs of 20.5°C and overnight lows around 12.4°C. Compared to the annual average high of 13.2°C, July runs +7.3°C.
July in Portsmouth averages a daytime high of 20.5°C and an overnight low of 12.4°C.
July runs +7.3°C compared to Portsmouth's annual average high of 13.2°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 20.5°C and cooler evenings around 12.4°C.