For Rottnest Island :
No gale warning.
The reliability of the situation is good.
Very cloudy with risk of thunderstorms in the morning, skies clouding over with storms forming in the afternoon. Some light showers in the morning, showers late in the day. In the evening, changeable skies becoming less cloudy.
Possibility of showers ENE force 4 turning SE in the middle of the day then ENE force 5. Gusts reaching 32 knots in the evening. Slight sea. Low, fairly long swell from SW. Excellent visibility.