Portsmouth Weather Forecast

    • 15
    • 21

    Sunny day

    • 13
    • 19

    Light rain shower

    • 10
    • 15

    Partly cloudy

    • 9
    • 15

    Sunny day

    • 10
    • 16

    Sunny day

    • 10
    • 16

    Partly cloudy

Today 19 Sep London and South East England

Unsettled and cloudy with blustery showers and longer spells of rain possible through the period, becoming heavy at times. Turning colder on Sunday.

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Portsmouth Temperature Statistics

September Temperature

Thorney Island (11km)

  • Lowest 14 September, 2025

    7.3 °C

  • Average September

    16.2 °C

  • Highest 6 September, 2025

    21.7 °C

Climate (2020–Present)

Thorney Island (11km)

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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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