Mosman Beach Weather Forecast

    • 14
    • 26

    Sunny

    • 17
    • 28

    Sunny

    • 18
    • 33

    Sunny

    • 21
    • 40

    Sunny

    • 25
    • 39

    Mostly sunny

    • 22
    • 28

    Partly cloudy

    • 16
    • 26

    Mostly sunny

Today 21 Dec Perth

Sunny. Winds south to southeasterly 15 to 25 km/h tending south to southwesterly 25 to 35 km/h in the early afternoon.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southerly 15 to 25 knots, reaching up to 30 knots in the evening.
Seas
Below 1 metre, increasing to 1.5 to 2 metres during the afternoon.
1st Swell
Southwesterly around 1 metre.
Weather
Sunny.
Weather Situation
A ridge persists over local waters. A weak front will brush the south coast on Monday, followed by the west coast trough returning by Tuesday.
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Mosman Beach Temperature Statistics View More

December Temperature

Swanbourne (7km)

  • Lowest 4 December, 2025

    14.6 °C

  • Average December

    22.4 °C

  • Highest 14 December, 2025

    41.1 °C

Climate (2020–Present)

Swanbourne (7km)

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  • Average Low 2020–2025

    14.6 °C

  • Average 2020–2025

    18.9 °C

  • Average High 2020–2025

    24.3 °C
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