Portsmouth Harbour - Haslar Marina Weather Forecast

    • 9
    • 11

    Sunny day

    • 9
    • 11

    Cloudy

    • 10
    • 12

    Overcast

    • 6
    • 11

    Cloudy

    • 10
    • 11

    Cloudy

    • 9
    • 12

    Cloudy

Today 13 Dec London and South East England

After a chilly start, it will be a mostly fine and dry day, with some good spells of sunshine for many. Temperatures near normal. Becoming breezier later in the day. Maximum Temperature 10C.

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Portsmouth Harbour - Haslar Marina Temperature Statistics

December Temperature

Thorney Island (14km)

  • Lowest 5 December, 2025

    -1.1 °C

  • Average December

    10.1 °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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