Onion Bay Weather Forecast

    • 6
    • 15

    Partly cloudy

    • 10
    • 12

    Shower

    • 6
    • 11

    Shower

    • 6
    • 11

    Shower

    • 7
    • 12

    Shower

    • 7
    • 12

    Shower

Today 14 Aug South West

Areas of frost and the chance of fog in the morning. Mostly sunny afternoon. Light winds becoming northerly 20 to 30 km/h in the morning. Overnight temperatures falling to between zero and 4 with daytime temperatures reaching around 16.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
West to northwesterly about 10 knots tending north to northwesterly 10 to 15 knots in the morning then tending north to northeasterly 15 to 20 knots in the early afternoon.
Seas
Around 1 metre, increasing to 1 to 1.5 metres in the west by early evening.
1st Swell
West to southwesterly 1 to 1.5 metres, increasing to 1.5 to 2 metres in the far west.
Weather
Mostly sunny.
Weather Situation
A high pressure system over South Australia extends a ridge over Victoria. The high will move east to be over the Tasman Sea by Thursday evening. Northerly flow will then strengthen ahead of a cold front which will cross Bass Strait on Friday, with further fronts and troughs to follow over the weekend embedded in cold southwesterly flow.
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 3 August, 2025

    5.5 °C

  • Average August

    11.5 °C

  • Highest 4 August, 2025

    17 °C

Climate (2020–Present)

Cape Otway (29km)

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  • Average Low 2020–2025

    11.7 °C

  • Average 2020–2025

    14.2 °C

  • Average High 2020–2025

    17.4 °C
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