Third Rocks Weather Forecast

    • 14
    • 19

    Partly cloudy

    • 13
    • 18

    Cloudy

    • 13
    • 19

    Shower or two

    • 10
    • 19

    Partly cloudy

    • 9
    • 20

    Sunny

    • 10
    • 21

    Partly cloudy

    • 13
    • 18

    Shower or two

Today 17 Aug Perth

Partly cloudy. High chance of showers, becoming less likely early this evening. Winds westerly 25 to 40 km/h decreasing to 15 to 20 km/h in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Westerly 20 to 25 knots, reaching up to 30 knots in the afternoon. Winds tending southwesterly 15 to 20 knots in the evening.
Seas
2 to 2.5 metres.
1st Swell
Westerly 2 to 3 metres, increasing to 3 to 4 metres by early evening.
Weather
Partly cloudy. 60% chance of showers.
Weather Situation
A cold front has passed through the area, bringing a gusty westerly change. Winds will ease during tonight and Tuesday 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

    14.3 °C

  • Highest 15 August, 2026

    21.8 °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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