Portsmouth Harbour - Haslar Marina Weather Forecast

    • 0
    • 4

    Partly cloudy

    • 4
    • 7

    Cloudy

    • 1
    • 5

    Sunny day

    • 0
    • 4

    Sunny day

    • 0
    • 4

    Sunny day

    • 2
    • 5

    Sunny day

Today 31 Dec London and South East England

Cloud clearing through the morning to leave a sunny but cold day. Turning cloudier overnight, but another very cold night expected with widespread frost. Maximum Temperature 5C.

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Portsmouth Harbour - Haslar Marina Temperature Statistics

December Temperature

Thorney Island (14km)

  • Lowest 5 December, 2025

    -1.1 °C

  • Average December

    8.5 °C

  • Highest 7 December, 2025

    13.9 °C

Climate (2020–Present)

Thorney Island (14km)

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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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