Carnac Island Weather Forecast

    • 13
    • 22

    Showers increasing

    • 10
    • 19

    Mostly sunny

    • 8
    • 19

    Sunny

    • 8
    • 22

    Mostly sunny

    • 10
    • 23

    Sunny

    • 13
    • 23

    Mostly sunny

    • 13
    • 22

    Showers

Today 21 May Perth

Partly cloudy. High chance of showers during this afternoon and evening. The chance of a thunderstorm this afternoon. Light winds becoming southwesterly 20 to 30 km/h in the middle of the day then tending southerly 15 to 25 km/h in the evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Variable below 10 knots becoming southwesterly 10 to 15 knots in the middle of the day then tending southerly 15 to 25 knots in the early afternoon.
Seas
Below 1 metre, increasing to 1 to 2 metres during the afternoon.
1st Swell
Southwesterly 1.5 to 2 metres.
Weather
Partly cloudy. 80% chance of showers. The chance of a thunderstorm this afternoon.
Weather Situation
A ridge over the local waters is weakening. A weak cold front will move across the west coast later today, ahead of a new ridge arriving on Friday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Carnac Island Temperature Statistics View More

May Temperature

Garden Island (13km)

  • Lowest 17 May, 2026

    8.4 °C

  • Average May

    16.8 °C

  • Highest 11 May, 2026

    26.2 °C

Climate (2021–Present)

Garden Island (13km)

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  • Average Low 2021–2026

    15.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    23.3 °C
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