For Rottnest Island :
No gale warning.
The reliability of the situation is good.
Warm sun all day. In the evening, clear skies.
ENE force 3 turning SW force 4 in the middle of the day then SSW. Gusts reaching 23 knots in the middle of the day. Moderate sea. Moderate, fairly long swell from SW then low in the middle of the day then from SW. Excellent visibility.