For Rottnest Island :
No gale warning.
The reliability of the situation is good.
A few fair-weather cumulus clouds in the morning, some sun but cloud building in the afternoon. No precipitation. In the evening, very cloudy.
No precipitation. SSW force 4 becoming force 5 in the middle of the day then S. Gusts reaching 29 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 WSW. Excellent visibility.