Portsmouth Harbour - Haslar Marina Weather Forecast

    • 19
    • 22

    Cloudy

    • 15
    • 22

    Cloudy

    • 13
    • 19

    Partly cloudy

    • 14
    • 19

    Cloudy

    • 16
    • 18

    Cloudy

    • 14
    • 21

    Partly cloudy

    • 16
    • 19

    Cloudy

Today 6 Sep London and South East England

Cloudy with outbreaks of rain through the morning, mostly clearing by mid-afternoon. Then dry with plenty of sunshine. Very warm. Maximum temperature 26 °C.

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Portsmouth Harbour - Haslar Marina Temperature Statistics

September Temperature

Thorney Island (14km)

  • Lowest 1 September, 2026

    10.8 °C

  • Average September

    17.8 °C

  • Highest 3 September, 2026

    23.5 °C

Climate (2021–2026)

Thorney Island (14km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    12.4 °C

  • Average High 2021–2026

    15.6 °C
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