For Rottnest Island :
No gale warning.
The reliability of the situation is good.
Cloudy spells, sometimes dense. No precipitation. In the evening, good clear periods but cloud building.
No precipitation. NW force 3 in the middle of the day becoming WNW force 2 in the evening. Rough to very rough sea becoming rough in the evening. Moderate, fairly long swell from SW. Excellent visibility.