Third Rocks Weather Forecast

    • 12
    • 17

    Shower or two

    • 13
    • 21

    Shower or two

    • 15
    • 19

    Showers

    • 12
    • 19

    Partly cloudy

    • 13
    • 19

    Showers

    • 12
    • 18

    Possible morning shower

    • 11
    • 20

    Partly cloudy

Today 26 Sep Perth

Cloudy. Medium chance of showers, becoming less likely in the late afternoon and evening. The chance of a thunderstorm in the northeast. Winds southeasterly 25 to 40 km/h.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southeasterly 15 to 25 knots, reaching up to 30 knots in the afternoon. Winds decreasing to 10 to 15 knots in the late evening.
Seas
1.5 to 2.5 metres.
1st Swell
Southwesterly 2 to 3 metres, decreasing to 1.5 to 2 metres by early evening.
Weather
Cloudy. 50% chance of showers.
Weather Situation
A ridge is extending south of the state. An inland trough and low will move west on the weekend across southern and central WA, moving close to the west coast on Sunday. A high will develop south of the Bight on the weekend and move east for the following few days. On Monday the low will slip into the Bight and the trough will move east, ahead of the next cold front which will approach on Tuesday.
Graph Plots Open in Graphs

  • 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

    16.7 °C

  • Highest 16 September, 2026

    29.3 °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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