Onion Bay Weather Forecast

    • 10
    • 13

    Shower

    • 6
    • 13

    Shower

    • 7
    • 14

    Partly cloudy

    • 8
    • 16

    Partly cloudy

    • 8
    • 17

    Partly cloudy

    • 10
    • 16

    Shower

    • 10
    • 16

    Shower

Today 14 Aug South West

Cloudy. Medium chance of showers, becoming less likely late this afternoon and evening. Winds west to northwesterly 15 to 20 km/h tending west to southwesterly 15 to 25 km/h in the middle of the day then becoming light in the late afternoon. Daytime maximum temperatures around 14.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
Westerly 15 to 20 knots, reaching up to 25 knots in the far east during the morning. Winds turning southwesterly in the early afternoon.
Seas
1 to 2 metres, decreasing to 1 to 1.5 metres during the afternoon.
1st Swell
Southwesterly 2 to 2.5 metres, increasing to 3 to 4 metres in the west.
Weather
Cloudy. 70% chance of showers.
Weather Situation
A high pressure system developing south of the Bight extends a ridge over Victoria. The high pressure system will drift slowly to the southeast over Tasmania over the weekend and centred over the Tasman Sea by early next week.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Onion Bay Temperature Statistics View More

August Temperature

Cape Otway (29km)

  • Lowest 1 August, 2026

    6.4 °C

  • Average August

    11.5 °C

  • Highest 2 August, 2026

    16.4 °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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