For Rottnest Island :
No gale warning.
The reliability of the situation is good.
Skies changeable, very cloudy for a time in the morning. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, skies with few clouds.
WSW force 3 becoming SW force 4 in the middle of the day then SSW force 3. Gusts reaching 19 knots in the middle of the day. Slight sea becoming moderate in the evening. Low, short swell from SW. Good visibility becoming excellent in the middle of the day.