Porpoise Bay Weather Forecast

    • 15
    • 19

    Rain

    • 12
    • 17

    Showers easing. Windy

    • 11
    • 19

    Wind easing. Partly cloudy

    • 12
    • 20

    Partly cloudy

    • 14
    • 20

    Sunny

    • 15
    • 20

    Shower or two

    • 12
    • 17

    Shower or two

Today 26 Aug Lower West

Cloudy. Very high chance of rain. The chance of a thunderstorm in the afternoon, possibly severe with heavy rain which may lead to flash flooding in the south. Winds west to northwesterly 15 to 25 km/h tending southeast to southwesterly 15 to 20 km/h in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northwest to southwesterly 10 to 15 knots tending southerly 15 to 20 knots in the evening.
Seas
Around 1 metre.
1st Swell
West to southwesterly 2.5 to 3 metres.
Weather
Cloudy. Near 100% chance of rain. The chance of a thunderstorm in the afternoon.
Weather Situation
A slow-moving cold front is moving over southwest WA. The front will weaken and combine with a trough over the Goldfields on Thursday as a ridge begins to extend south of the state. The ridge will slowly move east on Friday and Saturday with a weak west coast trough developing from Saturday afternoon.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Porpoise Bay Temperature Statistics View More

August Temperature

Rottnest Island (3km)

  • Lowest 9 August, 2026

    7.4 °C

  • Average August

    15.5 °C

  • Highest 16 August, 2026

    23.2 °C

Climate (2021–2026)

Rottnest Island (3km)

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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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