Portsmouth Harbour - Royal Clarence Marina Weather Forecast

    • 8
    • 14

    Light rain shower

    • 6
    • 13

    Light rain

    • 7
    • 13

    Light rain shower

    • 10
    • 13

    Cloudy

    • 9
    • 14

    Light rain

    • 11
    • 14

    Cloudy

    • 12
    • 15

    Cloudy

Today 13 May London and South East England

A day of sunshine and scattered blustery showers. The showers turning heavy at times with the odd rumble of thunder and hail. Feeling cool, especially in the wind. Maximum temperature 14 °C.

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Portsmouth Harbour - Royal Clarence Marina Temperature Statistics

May Temperature

Thorney Island (14km)

  • Lowest 12 May, 2026

    2 °C

  • Average May

    11.8 °C

  • Highest 9 May, 2026

    21.2 °C

Climate (2021–Present)

Thorney Island (14km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    12.1 °C

  • Average High 2021–2026

    15.3 °C
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