In June, Portsmouth typically sees daytime highs of 28.9°C and overnight lows around 17.9°C. Compared to the annual average high of 20.6°C, June runs +8.3°C.
June in Portsmouth averages a daytime high of 28.9°C and an overnight low of 17.9°C.
June runs +8.3°C compared to Portsmouth's annual average high of 20.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 28.9°C and cooler evenings around 17.9°C.