Portsmouth Harbour - M275 Motorway Bridge Weather Forecast

    • 18
    • 24

    Light rain

    • 16
    • 21

    Thunder shower

    • 17
    • 22

    Heavy rain shower

    • 16
    • 20

    Light rain

    • 15
    • 21

    Light rain shower

    • 16
    • 22

    Light rain shower

Today 19 Jul London and South East England

Turning slightly cooler and unsettled with widespread, often heavy and thundery rain or showers lasting much of the day, likely clearing into the evening to give another muggy night. Maximum Temperature 25C.

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Portsmouth Harbour - M275 Motorway Bridge Temperature Statistics

July Temperature

Thorney Island (11km)

  • Lowest 3 July, 2025

    10.3 °C

  • Average July

    19.4 °C

  • Highest 1 July, 2025

    27.4 °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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