Cape Northumberland Weather Forecast

    • 11
    • 15

    Shower

    • 9
    • 15

    Shower

    • 2
    • 15

    Cloudy

    • 9
    • 14

    Cloudy

    • 8
    • 15

    Partly cloudy

    • 5
    • 17

    Partly cloudy

    • 7
    • 21

    Partly cloudy

Today 6 Sep Lower South East

Cloudy. Slight chance of a shower, most likely at night. Winds westerly 15 to 20 km/h becoming light in the late afternoon then becoming west to southwesterly 15 to 20 km/h in the late evening. Daytime maximum temperatures around 16.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
Westerly 10 to 15 knots tending southwesterly in the late evening. Winds reaching up to 20 knots south of Port MacDonnell in the late evening.
Seas
Around 1 metre.
1st Swell
West to southwesterly 3 to 4 metres.
Weather
Cloudy.
Weather Situation
A ridge of high pressure lies across the state. A cold front will move across southern coasts early Monday but the ridge will persist further north. A trough over the interior of WA will be near stationary early to mid next week.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Cape Northumberland Temperature Statistics View More

September Temperature

Mount Gambier Airport (36km)

  • Lowest 1 September, 2026

    6.9 °C

  • Average September

    12.3 °C

  • Highest 1 September, 2026

    18.3 °C

Climate (2021–2026)

Mount Gambier Airport (36km)

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  • Average Low 2021–2026

    8.9 °C

  • Average 2021–2026

    13.7 °C

  • Average High 2021–2026

    20 °C
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