Third Rocks Weather Forecast

    • 13
    • 17

    Showers. Becoming windy

    • 6
    • 16

    Partly cloudy

    • 7
    • 17

    Mostly sunny

    • 7
    • 17

    Sunny

    • 8
    • 19

    Partly cloudy

    • 10
    • 20

    Mostly sunny

    • 10
    • 23

    Sunny

Today 10 Aug Perth

Cloudy. Very high chance of showers, becoming less likely in the evening. The chance of a thunderstorm in the morning and early afternoon. Possible small hail. Winds northwesterly 15 to 25 km/h shifting south to southwesterly 25 to 40 km/h in the early afternoon then becoming southerly 15 to 25 km/h in the evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Westerly 20 to 25 knots, reaching up to 30 knots during the afternoon and evening. Winds turning south to southwesterly 15 to 25 knots in the middle of the day.
Seas
1.5 metres, increasing to 2 to 2.5 metres during the morning.
1st Swell
Southwesterly 2 to 3 metres.
Weather
Cloudy. Near 100% chance of showers, with possible small hail. The chance of a thunderstorm in the morning.
Weather Situation
A high pressure ridge to the north will weaken as a cold front moves over the area on Monday. Another ridge will develop over the area on Tuesday in the wake of the cold front and dominate the weather pattern until the end of the week.
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 9 August, 2026

    8.7 °C

  • Average August

    14.6 °C

  • Highest 3 August, 2026

    21.2 °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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