Third Rocks Weather Forecast

    • 12
    • 19

    Shower or two

    • 11
    • 18

    Shower or two

    • 9
    • 17

    Partly cloudy

    • 12
    • 19

    Showers increasing

    • 14
    • 19

    Showers

    • 11
    • 17

    Shower or two

    • 8
    • 18

    Partly cloudy

Today 22 Aug Perth

Partly cloudy. Medium chance of showers. The chance of a thunderstorm. Winds southwesterly 15 to 20 km/h turning southerly 15 to 25 km/h in the late afternoon.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly below 10 knots increasing to 10 to 15 knots in the early afternoon then tending southerly 15 to 25 knots in the late afternoon.
Seas
Below 1 metre, increasing to 1 to 1.5 metres by early evening.
1st Swell
Southwesterly 1.5 to 2 metres.
Weather
Partly cloudy. The chance of a thunderstorm.
Weather Situation
A broad trough near the west coast will move inland this afternoon. A weak cold front will cross the southwest corner of the state early on Sunday ahead of a ridge extending across the area on Sunday and Monday. Another cold front will move over the far southwest of the state on Tuesday.
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

    14.8 °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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