The Basin Weather Forecast

    • 14
    • 17

    Cloudy

    • 14
    • 18

    Shower or two

    • 13
    • 18

    Mostly sunny

    • 13
    • 19

    Sunny

    • 14
    • 20

    Partly cloudy

    • 15
    • 18

    Shower or two

    • 12
    • 18

    Shower or two

Today 18 Aug Lower West

Cloudy. Slight chance of a shower in the south, near zero chance elsewhere. Winds west to southwesterly 15 to 20 km/h becoming light before dawn. Overnight temperatures falling to between 5 and 10 with daytime temperatures reaching between 16 and 19.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly 10 to 15 knots becoming variable below 10 knots in the early morning then becoming west to northwesterly 10 to 15 knots in the evening.
Seas
1 to 1.5 metres, decreasing below 1 metre during the morning.
1st Swell
West to southwesterly 2.5 to 4 metres.
Weather
Cloudy.
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

    15.4 °C

  • Highest 16 August, 2026

    23.2 °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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