The Basin Weather Forecast

    • 15
    • 19

    Mostly sunny

    • 15
    • 19

    Morning shower or two

    • 14
    • 19

    Partly cloudy

    • 13
    • 18

    Shower or two. Windy

    • 11
    • 17

    Shower or two. Wind easing

    • 12
    • 18

    Shower or two

    • 14
    • 18

    Shower or two

Today 22 Sep Lower West

Mostly sunny. The chance of fog inland early this morning. Light winds becoming southwesterly 15 to 20 km/h in the middle of the day then becoming light in the evening. Daytime maximum temperatures in the low 20s.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
South to southwesterly 10 to 15 knots decreasing to about 10 knots in the morning.
Seas
Below 1 metre.
1st Swell
Southwesterly 1.5 to 2.5 metres.
Weather
Mostly sunny.
Weather Situation
A ridge sits over the local waters, weakening tonight and strengthening late Tuesday ahead of the next cold front on Thursday.
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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