Portland Offshore Weather Forecast

    • 11
    • 16

    Rain

    • 11
    • 18

    Shower or two

    • 11
    • 17

    Possible shower

    • 12
    • 18

    Possible shower

    • 11
    • 17

    Cloudy

    • 11
    • 18

    Cloudy

    • 10
    • 23

    Mostly sunny

Today 21 Dec South West

Cloudy. Very high chance of rain, most likely in the morning and afternoon. The chance of a thunderstorm in the morning and early afternoon. Winds southeasterly 15 to 20 km/h tending south to southeasterly in the middle of the day then turning southwesterly 25 to 35 km/h in the early afternoon. Overnight temperatures falling to around 10 with daytime temperatures reaching between 17 and 22.

West Victoria Coastal Waters

SA-Vic Border to Cape Otway
Wind
Southeasterly 15 to 20 knots turning southwesterly 20 to 25 knots in the late afternoon.
Seas
Below 1 metre, increasing to 1 to 1.5 metres during the morning, then increasing to 1.5 to 2 metres by early evening.
1st Swell
South to southwesterly 1.5 to 2 metres, decreasing to 1.5 metres around midday, then tending southwesterly around 1 metre by early evening.
Weather
Cloudy. 90% chance of rain.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Portland Offshore Temperature Statistics View More

December Temperature

Cape Nelson Lighthouse (9km)

  • Lowest 5 December, 2025

    9.7 °C

  • Average December

    15.8 °C

  • Highest 18 December, 2025

    34.6 °C

Climate (2020–Present)

Cape Nelson Lighthouse (9km)

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  • Average Low 2020–2025

    11.8 °C

  • Average 2020–2025

    14.3 °C

  • Average High 2020–2025

    17.5 °C
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