Third Rocks Weather Forecast

    • 14
    • 19

    Showers

    • 15
    • 18

    Showers easing

    • 12
    • 17

    Showers

    • 9
    • 17

    Shower or two

    • 11
    • 17

    Shower or two

    • 9
    • 17

    Partly cloudy

    • 9
    • 18

    Sunny

Today 17 Jul Perth

Cloudy. Very high chance of showers. The chance of a thunderstorm. Winds northerly 15 to 25 km/h turning northwesterly in the late afternoon.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
North to northeasterly 10 to 15 knots turning northwesterly 15 to 25 knots in the late afternoon.
Seas
Around 1 metre, increasing to 1 to 1.5 metres by early evening.
1st Swell
Westerly 1.5 to 2 metres.
Weather
Cloudy. 90% chance of showers. The chance of a thunderstorm.
Weather Situation
A cold front moves through the Perth local waters later Friday and into Saturday. A weak ridge will begin to develop north of the local waters over the central west cost on Sunday, strengthening over southern WA on Tuesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Third Rocks Temperature Statistics View More

July Temperature

Garden Island (8km)

  • Lowest 8 July, 2026

    7 °C

  • Average July

    15 °C

  • Highest 15 July, 2026

    22.8 °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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