Portsmouth Harbour - Portchester Castle Weather Forecast

    • 3
    • 6

    Sunny day

    • 3
    • 7

    Heavy rain

    • 2
    • 6

    Cloudy

    • 0
    • 5

    Sunny day

    • 6
    • 7

    Cloudy

    • 6
    • 8

    Cloudy

Today 7 Jan London and South East England

Dry, windy but bright with sunny spells and patchy cloud on Wednesday. Increasingly cloudy with outbreaks of rain overnight. Rather cold. Maximum Temperature 4C.

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Portsmouth Harbour - Portchester Castle Temperature Statistics

January Temperature

Thorney Island (13km)

  • Lowest 6 January, 2026

    -4.3 °C

  • Average January

    0.5 °C

  • Highest 1 January, 2026

    7.4 °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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