Portsmouth Harbour - Inner Weather Forecast

    • 7
    • 15

    Sunny day

    • 6
    • 15

    Sunny day

    • 6
    • 14

    Sunny day

    • 5
    • 14

    Sunny day

    • 7
    • 12

    Partly cloudy

    • 6
    • 12

    Cloudy

    • 7
    • 11

    Light rain shower

Today 18 Mar London and South East England

Dry and sunny through Wednesday. Light winds for most, perhaps a touch breezier along the coast. Feeling warm in the sunshine away from the coastal breeze. Maximum temperature 19 °C.

Tonight 18 Mar London and South East England

After some late evening sunshine, clear skies overnight will lead to a chilly feel. Some isolated mist and fog patches forming through the early hours in prone spots. Minimum temperature 3 °C.

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Portsmouth Harbour - Inner Temperature Statistics

March Temperature

Thorney Island (13km)

  • Lowest 15 March, 2026

    0.1 °C

  • Average March

    8.8 °C

  • Highest 3 March, 2026

    15.6 °C

Climate (2021–2026)

Thorney Island (13km)

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  • Average Low 2021–2026

    8.7 °C

  • Average 2021–2026

    12 °C

  • Average High 2021–2026

    15.2 °C
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