Onion Bay Weather Forecast

    • 10
    • 13

    Shower

    • 7
    • 13

    Partly cloudy

    • 6
    • 16

    Partly cloudy

    • 10
    • 23

    Partly cloudy

    • 15
    • 20

    Shower

    • 12
    • 20

    Shower

    • 10
    • 15

    Shower

Today 26 Sep South West

Cloudy. Very high chance of showers and areas of drizzle, becoming less likely late this afternoon and evening. The chance of a thunderstorm this morning. Winds southerly 20 to 30 km/h turning southeasterly 15 to 25 km/h during the afternoon and evening. Daytime maximum temperatures around 15.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
Southerly 15 to 20 knots, reaching up to 25 knots offshore during the afternoon and evening.
Seas
Around 1 metre, increasing to 1 to 2 metres around midday.
1st Swell
Southwesterly 1 to 1.5 metres, increasing to 1.5 to 2.5 metres in the west.
Weather
Cloudy. 60% chance of showers. The chance of a thunderstorm this morning.
Weather Situation
A low pressure trough will move across Victoria early Saturday, as a band of mid-level cloud extends across the State. A cold front will clip the south of the State later Saturday, ahead of a strong high pressure system building south of the Bight. This high will extend a ridge over Tasmania and along the east coast of NSW on Sunday, before moving into the Tasman Sea late Monday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Onion Bay Temperature Statistics View More

September Temperature

Cape Otway (29km)

  • Lowest 8 September, 2026

    5.8 °C

  • Average September

    13.3 °C

  • Highest 20 September, 2026

    27.3 °C

Climate (2021–2026)

Cape Otway (29km)

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  • Average Low 2021–2026

    11.8 °C

  • Average 2021–2026

    14.3 °C

  • Average High 2021–2026

    17.5 °C
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