Castle Bay Weather Forecast

    • 9
    • 20

    Partly cloudy

    • 10
    • 18

    Shower or two

    • 9
    • 18

    Possible shower

    • 12
    • 20

    Showers

    • 11
    • 18

    Showers

    • 9
    • 18

    Shower or two

    • 8
    • 19

    Partly cloudy

Today 22 Aug South West

Partly cloudy. Slight chance of a shower in the north, near zero chance elsewhere. The chance of a thunderstorm in the north. Light winds.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Southerly 15 to 25 knots decreasing to 10 to 15 knots in the late evening.
Seas
1 to 1.5 metres, increasing to 1.5 to 2 metres offshore.
1st Swell
Southwesterly 2 to 2.5 metres.
Weather
Partly cloudy.
Weather Situation
A broad trough near the west coast will move inland this afternoon. A weak cold front will cross the southwest corner of the state early on Sunday ahead of a ridge extending across the southern half of the state on Sunday and Monday. Another cold front will move over the far southwest of the state on Tuesday.
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 2 August, 2026

    6 °C

  • Average August

    13.5 °C

  • Highest 3 August, 2026

    21.6 °C

Climate (2021–2026)

Cape Naturaliste (8km)

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  • Average Low 2021–2026

    13.2 °C

  • Average 2021–2026

    17.2 °C

  • Average High 2021–2026

    22.7 °C
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