Castle Bay Weather Forecast

    • 9
    • 19

    Clear

    • 9
    • 19

    Partly cloudy

    • 10
    • 19

    Partly cloudy

    • 9
    • 19

    Shower or two

    • 11
    • 19

    Shower or two

    • 13
    • 18

    Showers

    • 9
    • 17

    Showers

Today 31 Aug South West

Partly cloudy. Patches of frost in the north early this morning. Patchy fog early this morning. Slight chance of a shower near the Southwest Capes, near zero chance elsewhere. Light winds. Daytime maximum temperatures around 18.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Variable below 10 knots.
Seas
Below 0.5 metres.
1st Swell
Southwesterly 2 to 3 metres.
Weather
Mostly clear.
Weather Situation
A strong high pressure system in the Bight is moving east, with the ridge across southern WA weakening on Monday. A west coast trough will form on Monday as a weak cold front brushes past the southwest coast. A patchy cloud band will develop over central and southern WA on Tuesday, with the west coast trough moving inland on Wednesday ahead of a series of cold fronts in the second half of the week.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Castle Bay Temperature Statistics View More

August Temperature

Cape Naturaliste (8km)

  • Lowest 25 August, 2025

    6.2 °C

  • Average August

    13.5 °C

  • Highest 13 August, 2025

    21.9 °C

Climate (2020–Present)

Cape Naturaliste (8km)

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  • Average Low 2020–2025

    13.3 °C

  • Average 2020–2025

    17.2 °C

  • Average High 2020–2025

    22.7 °C
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