Portland Harbour Weather Forecast

    • 16
    • 19

    Sunny day

    • 16
    • 18

    Thunder shower

    • 16
    • 19

    Light rain shower

    • 15
    • 19

    Light rain shower

    • 14
    • 18

    Light rain shower

    • 15
    • 18

    Partly cloudy

    • 16
    • 19

    Cloudy

Today 31 Aug South West England

A day of sunshine and showers today, with the most frequent and heaviest showers likely across the west. Winds will also be strong, especially near the coast and across the moors. Temperatures around average. Maximum Temperature 20C.

Tonight 31 Aug South West England

Showers easing for a time this evening, especially in the east. Overnight, a more organised band of rain will gradually move in from the west. Remaining breezy. Minimum Temperature 13C.

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Portland Harbour Temperature Statistics

August Temperature

Isle Of Portland (6km)

  • Lowest 21 August, 2025

    12.9 °C

  • Average August

    18 °C

  • Highest 15 August, 2025

    23.9 °C

Climate (2020–Present)

Isle Of Portland (6km)

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  • Average Low 2020–2025

    10.3 °C

  • Average 2020–2025

    12.1 °C

  • Average High 2020–2025

    14 °C
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