The Basin Weather Forecast

    • 12
    • 19

    Morning shower or two. Windy

    • 11
    • 20

    Sunny

    • 13
    • 21

    Partly cloudy

    • 11
    • 21

    Mostly sunny

    • 14
    • 21

    Partly cloudy

    • 15
    • 20

    Mostly sunny

    • 15
    • 20

    Showers

Today 6 Sep Lower West

Partly cloudy. Slight chance of a shower in the north in the morning and early afternoon. Near zero chance of rain elsewhere. Winds southeasterly 25 to 35 km/h. Daytime maximum temperatures between 17 and 20.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
South to southeasterly 15 to 25 knots, reaching 30 knots offshore. Winds decreasing to 15 to 20 knots in the afternoon.
Seas
Below 1 metre, increasing to 1.5 to 2.5 metres during the morning.
1st Swell
Southwesterly 1.5 to 2.5 metres, decreasing to 1 to 1.5 metres during the morning, then increasing to 1.5 to 2 metres by early evening.
Weather
Partly cloudy.
Weather Situation
Southeasterly winds will prevail over the local waters as a ridge extends into the Bight. Winds tend easterly mid-week as the high pressure centre arrives in the Bight, continuing east.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

The Basin Temperature Statistics View More

September Temperature

Rottnest Island (3km)

  • Lowest 1 September, 2026

    12.5 °C

  • Average September

    15.5 °C

  • Highest 4 September, 2026

    19 °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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