Third Rocks Weather Forecast

    • 12
    • 19

    Partly cloudy

    • 10
    • 21

    Mostly sunny

    • 12
    • 21

    Partly cloudy

    • 11
    • 22

    Mostly sunny

    • 14
    • 22

    Partly cloudy

    • 15
    • 21

    Mostly sunny

    • 15
    • 20

    Showers

Today 6 Sep Perth

Cloudy. Slight chance of a shower about the northern suburbs in the morning and early afternoon. Near zero chance of rain elsewhere. Winds southeasterly 15 to 25 km/h increasing to 25 to 35 km/h in the morning.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
South to southeasterly 15 to 25 knots, reaching 30 knots offshore. Winds decreasing to 15 to 20 knots in the afternoon.
Seas
Below 1 metre, increasing to 1.5 to 2.5 metres during the morning.
1st Swell
Southwesterly 1.5 to 2.5 metres, decreasing to 1 to 1.5 metres during the morning, then increasing to 1.5 to 2 metres by early evening.
Weather
Partly cloudy.
Weather Situation
Southeasterly winds will prevail over the local waters as a ridge extends into the Bight. Winds tend easterly mid-week as the high pressure centre arrives in the Bight, continuing east.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Third Rocks Temperature Statistics View More

September Temperature

Garden Island (8km)

  • Lowest 1 September, 2026

    10.2 °C

  • Average September

    15.5 °C

  • Highest 3 September, 2026

    18.6 °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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