Perth FAD4 (offshore) Weather Forecast

    • 16
    • 18

    Cloudy

    • 17
    • 18

    Shower

    • 17
    • 18

    Partly cloudy

    • 16
    • 19

    Sunny

    • 16
    • 19

    Partly cloudy

    • 17
    • 18

    Shower

    • 16
    • 17

    Shower

Today 18 Aug Lower West

Partly cloudy. Slight chance of a shower in the south, near zero chance elsewhere. Winds west to southwesterly 15 to 20 km/h becoming light before dawn. Daytime maximum temperatures between 16 and 19.

Perth Coastal Waters

Two Rocks to Dawesville, offshore from Rottnest Island
Wind
Southwesterly 10 to 15 knots turning west to northwesterly in the late morning.
Seas
Around 1 metre, decreasing below 0.5 metres during the morning, then increasing to below 1 metre around midday.
1st Swell
Southwesterly 4 to 5 metres.
Weather
Cloudy.
Weather Situation
A cold front will continue moving eastward across the south coast this morning, contracting into the Bight later today. A weak ridge is developing over the west coast in the wake of this front. Another weak cold front will cross the southwest part of the State on Wednesday before a ridge settles over the south coast during Thursday and Friday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Perth FAD4 (offshore) Temperature Statistics View More

August Temperature

Rottnest Island (43km)

  • Lowest 9 August, 2026

    7.4 °C

  • Average August

    15.4 °C

  • Highest 16 August, 2026

    23.2 °C

Climate (2021–2026)

Rottnest Island (43km)

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  • Average Low 2021–2026

    16.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    22.8 °C
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