Western Sister Weather Forecast

    • 16
    • 21

    Partly cloudy

    • 12
    • 18

    Shower

    • 11
    • 16

    Windy

    • 11
    • 18

    Cloudy

    • 12
    • 27

    Sunny

    • 17
    • 27

    Partly cloudy

    • 15
    • 24

    Partly cloudy

Today 13 Dec Mornington Peninsula

Partly cloudy. Medium chance of showers, most likely this evening. The chance of a thunderstorm during the morning and afternoon. Winds north to northwesterly 15 to 25 km/h shifting south to southwesterly 20 to 30 km/h in the morning then becoming light in the late evening.

Port Phillip Local Waters

Wind
North to northwesterly 10 to 15 knots, reaching 15 to 20 knots in the north during the early morning. Winds shifting south to southwesterly 10 to 15 knots during the morning and reaching 15 to 20 knots during the late afternoon and evening.
Seas
Around 1 metre.
Weather
Partly cloudy. The chance of a thunderstorm in the morning and afternoon.
Weather Situation
A high pressure system lies over the Tasman Sea and extends a broad ridge over eastern Bass Strait. A low pressure trough extends across the SA border into western Victoria and Bass Strait. The trough is expected to slowly move east over Victoria and Bass Strait during Saturday, entering from the west in the early morning and moving into eastern Coastal waters by the evening. The next cold front will cross Bass Strait during Sunday with a new high pressure ridge developing in its wake on Monday.
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  • Temperature Forecast Bureau of Meteorology

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Western Sister Temperature Statistics View More

December Temperature

Cerberus (36km)

  • Lowest 3 December, 2025

    6 °C

  • Average December

    15.6 °C

  • Highest 4 December, 2025

    34 °C

Climate (2020–Present)

Cerberus (36km)

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  • Average Low 2020–2025

    10.1 °C

  • Average 2020–2025

    14.5 °C

  • Average High 2020–2025

    19.5 °C
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