For Rottnest Island :
No gale warning.
The reliability of the situation is very good.
Clear skies. In the evening, clear skies.
NW force 2 in the middle of the day turning ESE in the evening. Gusts reaching 8 knots in the middle of the day. Slight sea becoming moderate in the evening. Low, fairly long swell from WSW then moderate, long swell in the evening. Excellent visibility.