Mouth Flat Beach Weather Forecast

    • 10
    • 15

    Shower

    • 10
    • 15

    Partly cloudy

    • 8
    • 15

    Cloudy

    • 10
    • 14

    Windy

    • 10
    • 15

    Partly cloudy

    • 10
    • 16

    Sunny

    • 10
    • 19

    Partly cloudy

Today 6 Sep Kangaroo Island

Cloudy. Slight chance of a shower, becoming less likely in the evening. Winds westerly 15 to 20 km/h turning southwesterly in the early afternoon. Daytime maximum temperatures around 16.

South Central Coastal Waters

Wind
West to southwesterly about 10 knots increasing to 10 to 15 knots in the early afternoon.
Seas
Below 1 metre.
1st Swell
Southwesterly 3 to 4 metres, decreasing to 3 metres by early evening.
Weather
Cloudy.
Weather Situation
A ridge of high pressure lies across the state. A cold front will move across southern coasts early Monday but the ridge will persist further north. A trough over the interior of WA will be near stationary early to mid next week.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mouth Flat Beach Temperature Statistics View More

September Temperature

Cape Willoughby (17km)

  • Lowest 2 September, 2026

    9.9 °C

  • Average September

    13.9 °C

  • Highest 4 September, 2026

    18.1 °C

Climate (2021–2026)

Cape Willoughby (17km)

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  • Average Low 2021–2026

    13.3 °C

  • Average 2021–2026

    15.4 °C

  • Average High 2021–2026

    18.5 °C
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