The Basin Weather Forecast
- 11
- 17
Shower or two
- 13
- 17
Possible morning storm. Windy
- 10
- 17
Shower or two. Wind easing
- 12
- 17
Partly cloudy
- 12
- 17
Mostly sunny
- 12
- 19
Sunny
- 13
- 19
Sunny
Today 9 Aug Lower West
Cloudy. Medium chance of showers in the west, slight chance elsewhere. Light winds.
Perth Local Waters
Two Rocks to Dawesville, inshore from Rottnest Island- Wind
- North to northwesterly below 10 knots tending westerly 10 to 15 knots in the early afternoon.
- Seas
- Below 0.5 metres.
- 1st Swell
- Southwesterly 2.5 to 4 metres, decreasing to 2.5 to 3 metres by early evening.
- Weather
- Cloudy. 70% chance of showers.
- Weather Situation
- A high pressure ridge to the north will weaken as a cold front moves over the area on Monday. Another ridge will develop over the area on Tuesday in the wake of the cold front and dominate the weather pattern until the end of the week.
The Basin Temperature Statistics View More
August Temperature
Rottnest Island (3km)
Lowest 8 August, 2026
8.3 °CAverage August
15.4 °CHighest 3 August, 2026
20.4 °C
Climate (2021–2026)
Rottnest Island (3km)
Average Low 2021–2026
16.1 °CAverage 2021–2026
18.9 °CAverage High 2021–2026
22.8 °C