Perth FAD4 (offshore) Weather Forecast

    • 22
    • 23

    Partly cloudy

    • 21
    • 22

    Partly cloudy

    • 21
    • 21

    Windy

    • 19
    • 23

    Windy

    • 20
    • 22

    Windy

    • 20
    • 21

    Windy

    • 19
    • 21

    Windy

Today 15 Dec Lower West

Mostly sunny. Slight chance of a shower. The chance of a thunderstorm this afternoon. Winds north to northeasterly 20 to 30 km/h tending north to northwesterly 25 to 35 km/h in the morning then tending northwest to southwesterly 20 to 30 km/h in the early afternoon. Daytime maximum temperatures in the low to high 30s.

Perth Coastal Waters

Two Rocks to Dawesville, offshore from Rottnest Island
Wind
Northerly 10 to 15 knots turning west to northwesterly below 10 knots in the middle of the day then becoming west to southwesterly in the late afternoon.
Seas
Around 1 metre.
1st Swell
Southwesterly 1 to 1.5 metres.
Weather
Partly cloudy.
Weather Situation
A trough is deepening offshore from the west coast associated with a low pressure system, as a high pressure system strengthens in the Bight. The high will move east throughout today, allowing the trough to return to the west coast. The trough will move inland ahead of a cold front brushing the south coast by Tuesday. A new ridge will build across the southwest coast from Wednesday.
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 4 December, 2025

    16.7 °C

  • Average December

    21.3 °C

  • Highest 1 December, 2025

    36.2 °C

Climate (2020–Present)

Rottnest Island (43km)

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  • Average Low 2020–2025

    16.1 °C

  • Average 2020–2025

    18.9 °C

  • Average High 2020–2025

    22.8 °C
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