Castle Bay Weather Forecast

    • 17
    • 24

    Sunny

    • 16
    • 23

    Showers increasing

    • 12
    • 19

    Shower or two

    • 11
    • 19

    Showers easing

    • 10
    • 20

    Shower or two

    • 11
    • 20

    Possible shower

    • 11
    • 21

    Cloudy

Today 12 May South West

Mostly sunny. Slight chance of a shower near the Southwest Capes, near zero chance elsewhere. Winds north to northwesterly 20 to 30 km/h becoming light in the evening then becoming northerly 15 to 20 km/h in the late evening. Daytime maximum temperatures in the low to mid 20s.

Bunbury Geographe Coastal Waters

Dawesville to Cape Naturaliste
Wind
North to northwesterly 10 to 15 knots, reaching up to 20 knots offshore early in the morning. Winds decreasing to about 10 knots in the late afternoon.
Seas
1 to 1.5 metres, decreasing to 1 metre during the morning.
1st Swell
Westerly 1.5 to 2 metres, increasing to 2 to 3 metres during the morning.
Weather
Sunny.
Weather Situation
A ridge over southern and central WA will slowly weaken over the next couple of days. A cold front will move across the South West Land Division on Wednesday evening before weakening overnight, followed by another cold front brushing past the south coast on Thursday night into Friday. A new ridge will extend over southwest WA later Friday.
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

    15.7 °C

  • Highest 10 May, 2026

    21.6 °C

Climate (2021–Present)

Cape Naturaliste (8km)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    13.3 °C

  • Average 2021–2026

    17.2 °C

  • Average High 2021–2026

    22.7 °C
Get WillyWeather+ to remove ads