Castle Bay Weather Forecast

    • 11
    • 21

    Showers

    • 12
    • 21

    Showers

    • 12
    • 22

    Possible shower

    • 11
    • 22

    Sunny

    • 12
    • 23

    Mostly sunny

    • 12
    • 24

    Partly cloudy

    • 12
    • 23

    Cloud clearing

Today 16 May South West

Partly cloudy. Patchy fog in the east early this morning. High chance of showers in the southwest, slight chance elsewhere. Light winds. Daytime maximum temperatures around 18.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
South to southwesterly about 10 knots tending west to southwesterly 10 to 15 knots before dawn then decreasing to about 10 knots in the morning.
Seas
Below 1 metre.
1st Swell
Southwesterly 2 to 4 metres, decreasing to 2 to 3 metres during the morning.
Weather
Partly cloudy. 70% chance of showers.
Weather Situation
A ridge lies over southern WA and will persist into next week.
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

    16.3 °C

  • Highest 12 May, 2026

    25.2 °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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