The Basin Weather Forecast

    • 14
    • 19

    Showers easing. Very windy

    • 15
    • 19

    Shower or two

    • 15
    • 19

    Sunny

    • 15
    • 19

    Partly cloudy

    • 13
    • 19

    Mostly sunny

    • 14
    • 18

    Shower or two

    • 13
    • 18

    Showers

Today 19 Sep Lower West

Cloudy. Very high chance of showers in the south, high chance elsewhere. Winds northwesterly 25 to 35 km/h turning westerly 25 to 40 km/h in the early morning then decreasing to 15 to 20 km/h in the evening. Overnight temperatures falling to around 12 with daytime temperatures reaching between 17 and 20.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
West to northwesterly 20 to 25 knots, reaching up to 30 knots during the morning. Winds turning southwesterly 10 to 15 knots in the late evening.
Seas
2 to 3 metres, decreasing to 1 to 2 metres around midday.
1st Swell
Westerly 2 to 3 metres, increasing to 3 to 4 metres during the morning, then decreasing to 3 metres around midday.
Weather
Partly cloudy. 80% chance of showers.
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 9 September, 2026

    11.5 °C

  • Average September

    16.7 °C

  • Highest 16 September, 2026

    27.8 °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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