Portsmouth Harbour - Haslar Marina Weather Forecast

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    Sunny day

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    • 30

    Sunny day

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    Partly cloudy

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    Sunny day

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    Sunny day

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    Sunny day

Today 11 Jul London and South East England

Early morning low cloud quickly burning back, turning sunny by the afternoon before low cloud returns in a freshening northeasterly wind. Temperatures very warm but cooler along the coast. Maximum temperature 30 °C.

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Portsmouth Harbour - Haslar Marina Temperature Statistics

July Temperature

Thorney Island (14km)

  • Lowest 3 July, 2026

    11.6 °C

  • Average July

    21.1 °C

  • Highest 10 July, 2026

    30.8 °C

Climate (2021–2026)

Thorney Island (14km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    12.3 °C

  • Average High 2021–2026

    15.4 °C
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