Portsmouth Harbour - Inner Weather Forecast

    • 18
    • 22

    Cloudy

    • 17
    • 21

    Sunny day

    • 18
    • 22

    Sunny day

    • 16
    • 22

    Light rain shower

    • 15
    • 20

    Light rain shower

    • 15
    • 19

    Light rain shower

    • 15
    • 19

    Light rain shower

Today 23 Aug London and South East England

Dry throughout and cloudy this morning, with some bright or sunny spells gradually breaking through this afternoon. Becoming warm with any sunny spells that develop, these most likely across southern areas. Maximum Temperature 23C.

Tonight 23 Aug London and South East England

Dry and often cloudy, although occasional clear spells are likely to occur, these mainly across Kent and Sussex. There is a chance of patchy mist or fog developing if any clear spells become prolonged. Minimum Temperature 12C.

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Portsmouth Harbour - Inner Temperature Statistics

August Temperature

Thorney Island (13km)

  • Lowest 6 August, 2025

    9.9 °C

  • Average August

    18.6 °C

  • Highest 12 August, 2025

    28.1 °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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