Onion Bay Weather Forecast

    • 10
    • 16

    Shower

    • 9
    • 16

    Cloudy

    • 8
    • 16

    Partly cloudy

    • 9
    • 17

    Partly cloudy

    • 10
    • 16

    Shower

    • 9
    • 15

    Shower

    • 9
    • 15

    Shower

Today 20 May South West

Partly cloudy. High chance of showers in the south, medium chance elsewhere. Winds west to northwesterly 15 to 20 km/h tending west to southwesterly 20 to 30 km/h in the early morning then becoming light in the evening. Overnight temperatures falling to between 6 and 9 with daytime temperatures reaching around 16.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
Westerly 15 to 20 knots turning southwesterly during the morning. Winds reaching up to 25 knots in the far west during the morning.
Seas
1 to 1.5 metres, increasing to 1.5 to 2 metres in the far east.
1st Swell
Southwesterly 1 to 1.5 metres, increasing to 1.5 to 2.5 metres in the west.
Weather
Partly cloudy. 80% chance of showers.
Weather Situation
A high near the South Australian coast extends a ridge across northern Victoria while a weak cold front passes through Bass Strait during Wednesday morning. The ridge will extend across the remainder of Victoria late Wednesday then persist for Thursday and Friday. The high centre will move southeast on Saturday while the ridge continues to dominate.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Onion Bay Temperature Statistics View More

May Temperature

Cape Otway (29km)

  • Lowest 7 May, 2026

    6.3 °C

  • Average May

    14.9 °C

  • Highest 1 May, 2026

    27.4 °C

Climate (2021–Present)

Cape Otway (29km)

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  • Average Low 2021–2026

    11.7 °C

  • Average 2021–2026

    14.2 °C

  • Average High 2021–2026

    17.4 °C
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