Third Rocks Weather Forecast

    • 13
    • 17

    Possible shower

    • 14
    • 19

    Shower or two

    • 10
    • 18

    Partly cloudy

    • 9
    • 20

    Sunny

    • 10
    • 20

    Possible shower

    • 12
    • 18

    Showers

    • 9
    • 18

    Partly cloudy

Today 18 Aug Perth

Cloudy. Medium chance of showers. Light winds.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly below 10 knots becoming west to northwesterly in the morning then increasing to 10 to 15 knots in the evening.
Seas
Below 1 metre.
1st Swell
West to southwesterly 2.5 to 4 metres.
Weather
Cloudy.
Weather Situation
A cold front has passed through the area, bringing a gusty westerly change. Winds will ease during the day as a weak ridge extends across the west coast. A weaker cold front will pass by to the south during Wednesday before another ridge settles over the southern part of the State on Thursday and Friday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Third Rocks Temperature Statistics View More

August Temperature

Garden Island (8km)

  • Lowest 11 August, 2026

    7.7 °C

  • Average August

    14.7 °C

  • Highest 16 August, 2026

    23.7 °C

Climate (2021–2026)

Garden Island (8km)

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  • Average Low 2021–2026

    15.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    23.3 °C
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