Castle Bay Weather Forecast

    • 13
    • 20

    Shower or two

    • 11
    • 21

    Partly cloudy

    • 11
    • 24

    Sunny

    • 15
    • 25

    Sunny

    • 16
    • 23

    Shower or two

    • 13
    • 19

    Showers

    • 12
    • 19

    Shower or two

Today 13 Sep South West

Cloudy. Medium chance of showers. Winds west to northwesterly 20 to 30 km/h becoming light in the evening. Overnight temperatures falling to between 8 and 12 with daytime temperatures reaching around 19.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Westerly 15 to 20 knots turning southwesterly below 10 knots in the evening.
Seas
1 to 1.5 metres, decreasing below 1 metre during the afternoon.
1st Swell
West to southwesterly 2.5 to 3 metres.
Weather
Cloudy.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Castle Bay Temperature Statistics View More

September Temperature

Cape Naturaliste (8km)

  • Lowest 7 September, 2026

    8.8 °C

  • Average September

    14.6 °C

  • Highest 11 September, 2026

    20.6 °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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