The Basin Weather Forecast

    • 11
    • 19

    Mostly sunny

    • 15
    • 20

    Showers easing. Wind easing

    • 12
    • 17

    Possible morning shower

    • 10
    • 17

    Partly cloudy

    • 11
    • 19

    Sunny

    • 13
    • 20

    Possible shower

    • 13
    • 20

    Possible shower

Today 25 Jul Lower West

Mostly sunny. Winds northeasterly 15 to 25 km/h tending northerly 15 to 20 km/h in the middle of the day. Daytime maximum temperatures between 18 and 21.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northeasterly 10 to 15 knots turning north to northwesterly 15 to 20 knots in the middle of the day.
Seas
Around 1 metre.
1st Swell
Southwesterly around 1 metre, increasing to 1 to 1.5 metres during the morning.
Weather
Mostly sunny.
Weather Situation
A high pressure system near the Eucla coast extends a ridge over southern WA. The high will slowly move east on Saturday ahead of a cold front which will cross the southwest of the state on Sunday. A new ridge will develop over southern WA from Monday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

The Basin Temperature Statistics View More

July Temperature

Rottnest Island (3km)

  • Lowest 1 July, 2026

    9.9 °C

  • Average July

    15.4 °C

  • Highest 15 July, 2026

    21.8 °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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