Portland Harbour Weather Forecast

    • 11
    • 15

    Showers. Windy

    • 9
    • 15

    Shower or two

    • 9
    • 14

    Morning shower or two

    • 5
    • 14

    Possible shower

    • 9
    • 13

    Partly cloudy

    • 7
    • 15

    Mostly sunny

    • 5
    • 17

    Mostly sunny

Today 5 Sep South West

Cloudy. Very high chance of showers, most likely in the morning and afternoon. The chance of a thunderstorm in the morning, possibly severe. Damaging winds possible. Winds north to northwesterly 25 to 40 km/h turning westerly 35 to 50 km/h in the late morning and early afternoon then decreasing to 25 to 35 km/h in the late afternoon. Overnight temperatures falling to around 11 with daytime temperatures reaching around 14.

West Victoria Coastal Waters

SA-Vic Border to Cape Otway
Wind
North to northwesterly 20 to 30 knots turning westerly in the late morning. Winds reaching up to 35 knots in the late morning and early afternoon.
Seas
1 to 1.5 metres, increasing to 2 to 3 metres during the morning.
1st Swell
Southwesterly 3 to 5 metres, tending westerly 4 metres during the afternoon, then tending southwesterly 3 to 4 metres by early evening.
Weather
Cloudy. 95% chance of showers. The chance of a thunderstorm in the morning with possible squalls.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Portland Harbour Temperature Statistics View More

September Temperature

Cape Nelson Lighthouse (11km)

  • Lowest 1 September, 2026

    9.2 °C

  • Average September

    12.7 °C

  • Highest 1 September, 2026

    19.3 °C

Climate (2021–2026)

Cape Nelson Lighthouse (11km)

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  • Average Low 2021–2026

    11.9 °C

  • Average 2021–2026

    14.4 °C

  • Average High 2021–2026

    17.6 °C
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