Southern Harbour Weather Forecast

    • 13
    • 22

    Showers increasing. Windy

    • 14
    • 19

    Shower or two. Wind easing

    • 11
    • 21

    Sunny

    • 14
    • 21

    Showers

    • 14
    • 21

    Shower or two

    • 13
    • 23

    Sunny

    • 14
    • 24

    Partly cloudy

Today 20 Apr Perth

Becoming cloudy. Very high chance of showers, most likely during this evening. The chance of a thunderstorm in the southwest during this evening. Light winds becoming northwesterly 25 to 40 km/h in the middle of the day then tending westerly in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Variable below 10 knots becoming north to northwesterly 15 to 25 knots in the morning then tending west to northwesterly 25 to 30 knots in the evening. Winds reaching up to 35 knots in the late evening.
Seas
Below 1 metre, increasing to 1.5 to 2.5 metres around midday.
1st Swell
Southwesterly 1.5 to 2.5 metres.
Weather
Becoming cloudy. 95% chance of showers. The chance of a thunderstorm late this afternoon and evening.
Weather Situation
A ridge across the local waters is moving east. A strong cold front will move through this evening, followed by a new ridge tomorrow. A second moderate cold front will arrive on Thursday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Southern Harbour Temperature Statistics View More

April Temperature

Garden Island (12km)

  • Lowest 19 April, 2026

    12.3 °C

  • Average April

    19.2 °C

  • Highest 3 April, 2026

    28.7 °C

Climate (2021–Present)

Garden Island (12km)

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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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