Portsmouth Harbour - Portchester Castle Weather Forecast

    • 13
    • 22

    Sunny day

    • 17
    • 22

    Cloudy

    • 17
    • 20

    Cloudy

    • 15
    • 21

    Cloudy

    • 13
    • 21

    Partly cloudy

    • 14
    • 22

    Sunny day

Today 3 Jul London and South East England

Dry and fine with sunny spells, just a little fair weather cloud building into the afternoon. A little breeze developing, yet still feeling warm. Maximum Temperature 25C.

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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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