Portsmouth Harbour - M275 Motorway Bridge Weather Forecast

    • 16
    • 19

    Cloudy

    • 19
    • 22

    Cloudy

    • 15
    • 21

    Light rain shower

    • 12
    • 19

    Sunny day

    • 13
    • 19

    Sunny day

    • 13
    • 19

    Partly cloudy

Today 28 Sep London and South East England

Any fog soon clearing to leave hazy sunshine for most of the day. Feeling warm in the afternoon sunshine. Rain may affect Kent and Sussex by the evening and overnight. Maximum temperature 21 °C.

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Portsmouth Harbour - M275 Motorway Bridge Temperature Statistics

September Temperature

Thorney Island (11km)

  • Lowest 21 September, 2026

    8.8 °C

  • Average September

    17.2 °C

  • Highest 25 September, 2026

    23.9 °C

Climate (2021–2026)

Thorney Island (11km)

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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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