Secret Harbour Weather Forecast

    • 12
    • 19

    Shower or two developing

    • 11
    • 18

    Possible shower

    • 9
    • 17

    Partly cloudy

    • 13
    • 19

    Showers

    • 14
    • 18

    Showers

    • 9
    • 17

    Shower or two

    • 8
    • 18

    Partly cloudy

Today 22 Aug Mandurah

Partly cloudy. Medium chance of showers during this afternoon and evening. Light winds becoming southwesterly 15 to 20 km/h in the early afternoon then tending southerly 15 to 25 km/h in the late afternoon.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Variable about 10 knots becoming southwesterly 10 to 15 knots in the middle of the day then tending southerly 15 to 25 knots in the late afternoon.
Seas
Below 1 metre, increasing to 1 to 1.5 metres by early evening.
1st Swell
Southwesterly 1.5 to 2.5 metres.
Weather
Partly cloudy. 50% chance of showers. The chance of a thunderstorm during this afternoon and early evening.
Weather Situation
A weak ridge lies across southern WA. A trough is deepening down the west coast and will move inland on Saturday. A weak cold front will cross the southwest corner of the state early on Sunday ahead of another ridge which will extend across the southern half of the state on Sunday and Monday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Secret Harbour Temperature Statistics View More

August Temperature

Mandurah (13km)

  • Lowest 11 August, 2026

    5.4 °C

  • Average August

    14.4 °C

  • Highest 16 August, 2026

    22.3 °C

Climate (2021–2026)

Mandurah (13km)

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  • Average Low 2021–2026

    15.1 °C

  • Average 2021–2026

    19.1 °C

  • Average High 2021–2026

    23.8 °C
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