Third Rocks Weather Forecast

    • 13
    • 20

    Partly cloudy

    • 12
    • 18

    Shower or two

    • 14
    • 21

    Shower or two

    • 15
    • 19

    Showers

    • 13
    • 19

    Shower or two

    • 13
    • 19

    Showers

    • 11
    • 18

    Possible shower

Today 25 Sep Perth

Partly cloudy. Medium chance of showers during this afternoon and evening. Winds southeasterly 25 to 40 km/h increasing to 30 to 45 km/h in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southeasterly 15 to 25 knots, reaching up to 30 knots in the evening.
Seas
Around 1 metre, increasing to 1 to 1.5 metres during the morning, then increasing to 1.5 to 2.5 metres during the afternoon.
1st Swell
Southwesterly 1.5 to 2 metres, increasing to 2 to 3 metres around midday.
Weather
Partly cloudy.
Weather Situation
A cold front will pass south of the area during today. A ridge will extend across the southwest coast from Friday night. A trough and low pressure system will arrive near the west coast on Sunday. As the high moves east on Monday, the low pressure system will slip into the Bight, with the trough moving inland again ahead of the next cold front arriving 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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