Onion Bay Weather Forecast

    • 12
    • 15

    Shower

    • 9
    • 12

    Shower

    • 7
    • 11

    Shower

    • 7
    • 11

    Shower

    • 6
    • 11

    Shower

    • 8
    • 13

    Shower

    • 8
    • 14

    Shower

Today 26 Aug South West

Cloudy. Very high chance of showers, most likely in the morning and afternoon. The chance of a thunderstorm in the afternoon and evening. Damaging winds possible near the Grampians. Winds northerly 25 to 40 km/h turning northwesterly 20 to 30 km/h in the early afternoon. Overnight temperatures falling to around 10 with daytime temperatures reaching between 13 and 17.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
Northerly 15 to 25 knots, reaching up to 30 knots during the day. Winds turning northwesterly in the middle of the day.
Seas
1.5 to 2.5 metres.
1st Swell
Southwesterly 1 to 2 metres, decreasing to 1 to 1.5 metres during the morning.
Weather
Cloudy. 95% chance of showers. The chance of a thunderstorm in the west in the afternoon and evening.
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 20 August, 2025

    4 °C

  • Average August

    11.4 °C

  • Highest 21 August, 2025

    19.6 °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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