For Rottnest Island :
No gale warning.
The reliability of the situation is good.
Skies changeable to very cloudy. Risk of some spots of rain in the morning, possibility of showers in the afternoon. In the evening, good clear periods but cloud building.
No precipitation. WSW force 3 in the morning becoming SW force 4 in the middle of the day. Gusts reaching 17 knots in the middle of the day. Moderate sea becoming rough in the middle of the day. Moderate, fairly long swell from WSW. Excellent visibility.