Castle Bay Weather Forecast

    • 10
    • 19

    Partly cloudy

    • 8
    • 21

    Mostly sunny

    • 9
    • 21

    Sunny

    • 10
    • 22

    Sunny

    • 12
    • 22

    Mostly sunny

    • 12
    • 22

    Shower or two

    • 14
    • 21

    Showers

Today 6 Sep South West

Partly cloudy. Slight chance of a shower, most likely in the early morning. Winds south to southwesterly 15 to 25 km/h turning southeasterly 25 to 35 km/h early in the morning then decreasing to 15 to 20 km/h in the evening. Overnight temperatures falling to between 7 and 11 with daytime temperatures reaching around 17.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
Southerly 20 to 30 knots, tending southeasterly 20 to 25 knots in the afternoon.
Seas
1 to 2 metres, increasing to 2 to 3 metres during the morning, then decreasing to 1.5 to 2 metres during the afternoon.
1st Swell
Southwesterly 1.5 to 2.5 metres inshore, increasing to 2 to 4 metres offshore.
Weather
Partly cloudy. 50% chance of showers.
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 1 September, 2026

    9 °C

  • Average September

    14.2 °C

  • Highest 3 September, 2026

    19.4 °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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