Castle Bay Weather Forecast
- 9
- 19
Clear
- 9
- 19
Partly cloudy
- 10
- 19
Partly cloudy
- 9
- 19
Shower or two
- 11
- 19
Shower or two
- 13
- 18
Showers
- 9
- 17
Showers
Today 31 Aug South West
Partly cloudy. Patches of frost in the north early this morning. Patchy fog early this morning. Slight chance of a shower near the Southwest Capes, near zero chance elsewhere. Light winds. Daytime maximum temperatures around 18.
Bunbury Geographe Coastal Waters
Dawesville to Cape Naturaliste- Wind
- Variable below 10 knots.
- Seas
- Below 0.5 metres.
- 1st Swell
- Southwesterly 2 to 3 metres.
- Weather
- Mostly clear.
- Weather Situation
- A strong high pressure system in the Bight is moving east, with the ridge across southern WA weakening on Monday. A west coast trough will form on Monday as a weak cold front brushes past the southwest coast. A patchy cloud band will develop over central and southern WA on Tuesday, with the west coast trough moving inland on Wednesday ahead of a series of cold fronts in the second half of the week.
Castle Bay Temperature Statistics View More
August Temperature
Cape Naturaliste (8km)
Lowest 25 August, 2025
6.2 °CAverage August
13.5 °CHighest 13 August, 2025
21.9 °C
Climate (2020–Present)
Cape Naturaliste (8km)
Average Low 2020–2025
13.3 °CAverage 2020–2025
17.2 °CAverage High 2020–2025
22.7 °C