The Basin Weather Forecast

    • 13
    • 18

    Showers. Possible storm

    • 12
    • 17

    Shower or two

    • 13
    • 17

    Shower or two

    • 12
    • 19

    Shower or two

    • 13
    • 17

    Showers. Windy

    • 9
    • 15

    Showers. Windy

    • 10
    • 16

    Shower or two

Today 20 Aug Lower West

Cloudy. Very high chance of showers, becoming less likely late this afternoon and evening. The chance of a thunderstorm during the morning and afternoon. Winds northwesterly 15 to 25 km/h turning west to southwesterly 25 to 35 km/h in the late morning and afternoon. Daytime maximum temperatures between 16 and 20.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northwesterly 15 to 20 knots, reaching up to 30 knots in the early afternoon. Winds turning southwesterly 15 to 25 knots in the late afternoon.
Seas
Around 1 metre, increasing to 1.5 to 2 metres during the morning.
1st Swell
West to southwesterly 2 to 3 metres, increasing to 3 to 4 metres by early evening.
Weather
Cloudy. 90% chance of showers. The chance of a thunderstorm during the morning and afternoon.
Weather Situation
Another cold front will move through today, followed by a ridge on Thursday, persisting until the weekend.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

The Basin Temperature Statistics View More

August Temperature

Rottnest Island (3km)

  • Lowest 4 August, 2025

    9.2 °C

  • Average August

    15.9 °C

  • Highest 13 August, 2025

    22.4 °C

Climate (2020–Present)

Rottnest Island (3km)

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  • Average Low 2020–2025

    16.1 °C

  • Average 2020–2025

    19 °C

  • Average High 2020–2025

    22.8 °C
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