The Basin Weather Forecast

    • 15
    • 19

    Showers. Very windy

    • 13
    • 18

    Possible shower

    • 14
    • 18

    Shower or two

    • 14
    • 18

    Possible shower

    • 13
    • 19

    Mostly sunny

    • 13
    • 18

    Possible shower

    • 12
    • 17

    Shower or two

Today 17 Aug Lower West

Cloudy. Very high chance of showers, most likely in the morning and afternoon. The chance of a thunderstorm near the coast in the morning. Winds north to northeasterly 15 to 25 km/h shifting westerly 25 to 40 km/h in the middle of the day then decreasing to 20 to 30 km/h in the evening. Overnight temperatures falling to around 11 with daytime temperatures reaching between 18 and 21.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northerly 15 to 20 knots, shifting west to southwesterly 15 to 25 knots in the middle of the day. Winds reaching up to 30 knots in the late morning and afternoon.
Seas
Around 1 metre, increasing to 1.5 to 2.5 metres during the morning.
1st Swell
West to southwesterly 1.5 to 2 metres, increasing to 2 to 3 metres during the morning.
Weather
Cloudy. Near 100% chance of showers. The chance of a thunderstorm in the morning.
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 9 August, 2026

    7.4 °C

  • Average August

    15.1 °C

  • Highest 15 August, 2026

    21.7 °C

Climate (2021–2026)

Rottnest Island (3km)

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  • Average Low 2021–2026

    16.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    22.8 °C
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