Portsmouth Harbour - Inner Weather Forecast

    • 7
    • 8

    Cloudy

    • 6
    • 9

    Heavy rain

    • 8
    • 9

    Partly cloudy

    • 6
    • 9

    Cloudy

    • 7
    • 8

    Overcast

    • 6
    • 8

    Overcast

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Portsmouth Harbour - Inner Temperature Statistics

January Temperature

Thorney Island (13km)

  • Lowest 6 January, 2026

    -4.9 °C

  • Average January

    3.6 °C

  • Highest 12 January, 2026

    10.6 °C

Climate (2021–Present)

Thorney Island (13km)

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  • Average Low 2021–2026

    8.6 °C

  • Average 2021–2026

    11.9 °C

  • Average High 2021–2026

    15.1 °C
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