Perth FAD4 (offshore) Weather Forecast

    • 19
    • 21

    Windy

    • 17
    • 20

    Windy

    • 19
    • 22

    Windy

    • 20
    • 24

    Sunny

    • 23
    • 26

    Sunny

    • 25
    • 27

    Partly cloudy

    • 22
    • 23

    Partly cloudy

Today 20 Dec Lower West

Mostly sunny. Winds southerly 25 to 35 km/h turning southeasterly 15 to 25 km/h in the evening. Daytime maximum temperatures in the mid to high 20s.

Perth Coastal Waters

Two Rocks to Dawesville, offshore from Rottnest Island
Wind
Southerly 20 to 25 knots increasing to 25 to 30 knots in the late afternoon then tending southeasterly in the late evening.
Seas
1.5 to 2.5 metres.
1st Swell
South to southwesterly 1 to 1.5 metres.
Weather
Partly cloudy.
Weather Situation
A west coast trough will move to the Goldfields and inland Gascoyne today as a weak front brushes past the south coast. A ridge will then develop across much of southern WA on Sunday, pushing the trough further north. Another weak front will brush the south coast on Monday, followed by the west coast trough returning by Tuesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Perth FAD4 (offshore) Temperature Statistics View More

December Temperature

Rottnest Island (43km)

  • Lowest 18 December, 2025

    16.5 °C

  • Average December

    21.5 °C

  • Highest 14 December, 2025

    37.1 °C

Climate (2020–Present)

Rottnest Island (43km)

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  • Average Low 2020–2025

    16.1 °C

  • Average 2020–2025

    19 °C

  • Average High 2020–2025

    22.8 °C
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