Southern Harbour Weather Forecast

    • 15
    • 23

    Showers increasing

    • 14
    • 19

    Showers easing. Wind easing

    • 14
    • 20

    Possible shower

    • 13
    • 22

    Sunny

    • 13
    • 20

    Possible shower

    • 13
    • 20

    Mostly sunny

    • 12
    • 20

    Mostly sunny

Today 18 Sep Perth

Cloudy. High chance of showers, most likely in the afternoon and evening. Winds north to northeasterly 15 to 20 km/h turning west to northwesterly 25 to 35 km/h in the middle of the day.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
North to northeasterly 10 to 15 knots turning west to northwesterly 15 to 25 knots in the early afternoon. Winds reaching up to 30 knots in the late evening.
Seas
Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
1st Swell
West to southwesterly 1 to 1.5 metres, increasing to 1 to 2 metres during the morning.
Weather
Cloudy. 90% chance of showers. The chance of a thunderstorm in the evening.
Weather Situation
A trough extends down the west coast. The trough will move inland today ahead of a cold front which will pass over the local waters, before the next ridge begins to develop Saturday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Southern Harbour Temperature Statistics View More

September Temperature

Garden Island (12km)

  • Lowest 1 September, 2026

    10.2 °C

  • Average September

    16.8 °C

  • Highest 16 September, 2026

    29.3 °C

Climate (2021–2026)

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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