Portsmouth Harbour - Portchester Castle Weather Forecast

    • 13
    • 25

    Partly cloudy

    • 13
    • 22

    Sunny day

    • 16
    • 21

    Cloudy

    • 17
    • 20

    Cloudy

    • 15
    • 20

    Cloudy

    • 13
    • 21

    Light rain shower

Today 2 Jul London and South East England

A cloudy start across the region with thundery rain possibly affecting parts of Kent and Sussex at first. Increasing sunny spells spreading in from the west, feeling fresher than late. Maximum Temperature 27C.

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Portsmouth Harbour - Portchester Castle Temperature Statistics

July Temperature

Thorney Island (13km)

  • Lowest 1 July, 2025

    18.5 °C

  • Average July

    19.9 °C

  • Highest 1 July, 2025

    24 °C

Climate (2020–Present)

Thorney Island (13km)

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  • Average Low 2020–2025

    8.6 °C

  • Average 2020–2025

    11.9 °C

  • Average High 2020–2025

    15.1 °C
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