In June, Portsmouth typically sees daytime highs of 18.9°C and overnight lows around 10.5°C. Compared to the annual average high of 13.2°C, June runs +5.7°C.
June in Portsmouth averages a daytime high of 18.9°C and an overnight low of 10.5°C.
June runs +5.7°C compared to Portsmouth's annual average high of 13.2°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 10.5°C.