Castle Bay Weather Forecast

    • 14
    • 23

    Windy. Mostly sunny

    • 17
    • 24

    Partly cloudy

    • 16
    • 23

    Showers

    • 12
    • 19

    Shower or two

    • 11
    • 19

    Shower or two

    • 10
    • 20

    Shower or two

    • 10
    • 21

    Partly cloudy

Today 11 May South West

Mostly sunny. Winds northeasterly 15 to 20 km/h turning northerly 25 to 40 km/h during the morning then decreasing to 15 to 25 km/h in the late afternoon. Overnight temperatures falling to between 6 and 12 with daytime temperatures reaching the low to mid 20s.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
North to northeasterly 15 to 20 knots increasing to 25 knots before tending north to northwesterly 15 to 20 knots during the day.
Seas
Around 1 metre, increasing to 1 to 2 metres during the morning.
1st Swell
West to southwesterly 1 to 1.5 metres inshore, increasing to 1 to 2 metres offshore.
Weather
Sunny.
Weather Situation
A high pressure system will move slowly eastwards across the Great Australian Bight during the next few days. A cold front will approach the southwest coast on Wednesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Castle Bay Temperature Statistics View More

May Temperature

Cape Naturaliste (8km)

  • Lowest 5 May, 2026

    9.3 °C

  • Average May

    15.3 °C

  • Highest 7 May, 2026

    21.4 °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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