Porpoise Bay Weather Forecast

    • 18
    • 25

    Sunny

    • 20
    • 25

    Becoming windy. Sunny

    • 18
    • 27

    Windy. Sunny

    • 18
    • 29

    Sunny

    • 22
    • 30

    Partly cloudy

    • 22
    • 29

    Partly cloudy

    • 21
    • 25

    Mostly sunny

Today 10 Dec Lower West

Sunny. Winds easterly 25 to 35 km/h tending northeast to southeasterly 15 to 25 km/h in the middle of the day then tending south to southwesterly 25 to 35 km/h in the early afternoon. Daytime maximum temperatures in the low to high 30s.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southeasterly 10 to 15 knots tending southerly 15 to 20 knots in the morning.
Seas
Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
1st Swell
Southwesterly 1 to 1.5 metres.
Weather
Sunny.
Weather Situation
An inland trough will move closer to the west coast by the weekend where it is expected to deepen. The trough will move offshore on Sunday as a high pressure system moves into the Bight and strengthens.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Porpoise Bay Temperature Statistics View More

December Temperature

Rottnest Island (3km)

  • Lowest 4 December, 2025

    16.7 °C

  • Average December

    20.3 °C

  • Highest 1 December, 2025

    36.2 °C

Climate (2020–Present)

Rottnest Island (3km)

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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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