Portsmouth Harbour - Portchester Lake Weather Forecast

    • 22
    • 36

    Sunny day

    • 21
    • 31

    Sunny day

    • 18
    • 24

    Sunny day

    • 18
    • 25

    Sunny day

    • 14
    • 22

    Partly cloudy

    • 15
    • 21

    Cloudy

Today 24 Jun London and South East England

Dry with long sunny periods and light winds. Widely very warm or hot with heatwave conditions expected, including overnight. Maximum temperature 39 °C.

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Portsmouth Harbour - Portchester Lake Temperature Statistics

June Temperature

Thorney Island (13km)

  • Lowest 11 June, 2026

    9 °C

  • Average June

    16 °C

  • Highest 21 June, 2026

    27.3 °C

Climate (2021–2026)

Thorney Island (13km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    12.2 °C

  • Average High 2021–2026

    15.4 °C
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