Castle Bay Weather Forecast

    • 17
    • 30

    Sunny

    • 16
    • 31

    Partly cloudy

    • 17
    • 28

    Mostly sunny

    • 15
    • 26

    Cloud clearing

    • 15
    • 26

    Partly cloudy

    • 14
    • 26

    Mostly sunny

    • 13
    • 28

    Cloud clearing

Today 19 Mar South West

Mostly sunny. Slight chance of a shower in the south during this afternoon and evening. Near zero chance of rain elsewhere. Light winds becoming southeast to southwesterly 15 to 25 km/h in the morning then becoming southeasterly 15 to 20 km/h in the evening. Daytime maximum temperatures 25 to 35.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Southerly 10 to 15 knots, reaching up to 20 knots offshore during the day.
Seas
Around 1 metre, increasing to 1 to 1.5 metres offshore.
1st Swell
Southwesterly 1 to 1.5 metres, increasing to 1 to 2 metres around midday.
Weather
Sunny.
Weather Situation
A ridge lies over southeastern parts of the State. A trough will remain near the west coast for much of the week before moving inland on Saturday as a new ridge pushes in from the southwest.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Castle Bay Temperature Statistics View More

March Temperature

Cape Naturaliste (8km)

  • Lowest 12 March, 2026

    12.2 °C

  • Average March

    20.1 °C

  • Highest 7 March, 2026

    32.3 °C

Climate (2021–Present)

Cape Naturaliste (8km)

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  • Average Low 2021–2026

    13.3 °C

  • Average 2021–2026

    17.2 °C

  • Average High 2021–2026

    22.7 °C
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