Onion Bay Weather Forecast

    • 5
    • 18

    Partly cloudy

    • 11
    • 17

    Shower

    • 6
    • 12

    Shower

    • 8
    • 14

    Shower

    • 8
    • 12

    Shower

    • 8
    • 14

    Shower

    • 9
    • 16

    Cloudy

Today 18 Sep South West

Partly cloudy. Slight chance of a shower in the south, most likely this evening. Near zero chance of rain elsewhere. Winds northerly 15 to 20 km/h tending north to northwesterly 30 to 45 km/h in the morning then becoming northerly 20 to 30 km/h in the evening. Daytime maximum temperatures around 19.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
North to northwesterly 15 to 20 knots.
Seas
Around 1 metre, increasing to 1 to 1.5 metres in the east during the morning.
1st Swell
West to southwesterly 2 to 3 metres.
Weather
Partly cloudy. The chance of a thunderstorm in the far west late this afternoon and evening.
Weather Situation
A weak high pressure system to the north of Victoria will move into the Tasman Sea today, before a series of cold fronts cross Bass Strait between late Friday and early 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 6 September, 2025

    6.9 °C

  • Average September

    12.6 °C

  • Highest 15 September, 2025

    24.3 °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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