Castle Bay Weather Forecast

    • 13
    • 20

    Partly cloudy

    • 10
    • 21

    Partly cloudy

    • 12
    • 21

    Partly cloudy

    • 11
    • 21

    Partly cloudy

    • 11
    • 21

    Shower or two

    • 11
    • 18

    Shower or two

    • 10
    • 19

    Shower or two

Today 20 Sep South West

Cloudy. Medium chance of showers in the south, slight chance elsewhere. Winds west to southwesterly 15 to 20 km/h becoming light before dawn. Daytime maximum temperatures between 17 and 21.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Southwesterly 10 to 15 knots turning south to southeasterly below 10 knots in the early morning then becoming south to southwesterly in the evening.
Seas
Around 1 metre, decreasing below 0.5 metres around midday.
1st Swell
West to southwesterly 2 to 3 metres inshore, increasing to 2.5 to 4 metres offshore.
Weather
Partly cloudy.
Weather Situation
A trough moves east through the Southern Interior and Eucla districts before leaving the state this morning as a new ridge builds over the southwest. Later tomorrow another trough will build in the west moving eastward on Tuesday as a cold front passes to the south of the state.
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

    15.4 °C

  • Highest 16 September, 2026

    25.4 °C

Climate (2021–2026)

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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