Castle Bay Weather Forecast
- 14
- 23
Windy. Mostly sunny
- 17
- 24
Partly cloudy
- 16
- 23
Showers
- 12
- 19
Shower or two
- 11
- 19
Shower or two
- 10
- 20
Shower or two
- 10
- 21
Partly cloudy
Today 11 May South West
Mostly sunny. Winds northeasterly 15 to 20 km/h turning northerly 25 to 40 km/h during the morning then decreasing to 15 to 25 km/h in the late afternoon. Overnight temperatures falling to between 6 and 12 with daytime temperatures reaching the low to mid 20s.
Bunbury Geographe Coastal Waters
Dawesville to Cape Naturaliste- Wind
- North to northeasterly 15 to 20 knots increasing to 25 knots before tending north to northwesterly 15 to 20 knots during the day.
- Seas
- Around 1 metre, increasing to 1 to 2 metres during the morning.
- 1st Swell
- West to southwesterly 1 to 1.5 metres inshore, increasing to 1 to 2 metres offshore.
- Weather
- Sunny.
- Weather Situation
- A high pressure system will move slowly eastwards across the Great Australian Bight during the next few days. A cold front will approach the southwest coast on Wednesday.
Castle Bay Temperature Statistics View More
May Temperature
Cape Naturaliste (8km)
Lowest 5 May, 2026
9.3 °CAverage May
15.3 °CHighest 7 May, 2026
21.4 °C
Climate (2021–Present)
Cape Naturaliste (8km)
Average Low 2021–2026
13.3 °CAverage 2021–2026
17.2 °CAverage High 2021–2026
22.7 °C