Onion Bay Weather Forecast

    • 13
    • 23

    Shower

    • 8
    • 12

    Windy

    • 3
    • 14

    Partly cloudy

    • 6
    • 18

    Sunny

    • 10
    • 21

    Cloudy

    • 13
    • 23

    Shower

    • 12
    • 17

    Shower

Today 20 Sep South West

Becoming cloudy. High chance of showers in the south, medium chance elsewhere. Damaging winds possible near the Otways, easing later in the day. Winds northerly 25 to 35 km/h increasing to 35 to 50 km/h in the morning then turning westerly 30 to 45 km/h in the early afternoon. Overnight temperatures falling to between 9 and 12 with daytime temperatures reaching the low to mid 20s.

Central Victoria Coastal Waters

Cape Otway to Wilsons Promontory
Wind
North to northwesterly 15 to 25 knots, reaching up to 30 knots during the day. Winds turning westerly 20 to 25 knots in the late afternoon.
Seas
Around 1 metre, increasing to 1.5 to 2 metres during the morning, then increasing to 2 to 3 metres around midday.
1st Swell
Southwesterly 1.5 to 2.5 metres, tending westerly 2 to 3 metres by early evening.
Weather
Mostly sunny day. 60% chance of showers in the evening.
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 8 September, 2026

    5.8 °C

  • Average September

    12.9 °C

  • Highest 13 September, 2026

    24.6 °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

    17.4 °C
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