Cape Northumberland Weather Forecast

    • 11
    • 21

    Shower

    • 11
    • 17

    Shower

    • 9
    • 14

    Shower

    • 9
    • 13

    Cloudy

    • 6
    • 15

    Cloudy

    • 5
    • 21

    Sunny

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    • 23

    Sunny

Today 13 Sep Lower South East

Cloudy. Very high chance of showers, becoming less likely in the late afternoon and evening. The chance of a thunderstorm in the late morning and afternoon. Winds northerly 20 to 30 km/h turning west to northwesterly 15 to 25 km/h in the late afternoon. Daytime maximum temperatures around 20.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
Northerly 15 to 20 knots turning westerly in the evening.
Seas
1 to 1.5 metres.
1st Swell
Southwesterly 2 to 2.5 metres.
Weather
Cloudy. 70% chance of showers. The chance of a thunderstorm north of Port MacDonnell in the late morning and afternoon.
Weather Situation
A trough will move across SA today ahead of a high pressure ridge that will build in the wake. A cold front will then slip across southern coasts late Monday and early Tuesday, before the high moves across waters to the south to be centred over Victoria by Thursday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Cape Northumberland Temperature Statistics View More

September Temperature

Mount Gambier Airport (36km)

  • Lowest 8 September, 2026

    0.3 °C

  • Average September

    11 °C

  • Highest 11 September, 2026

    19.4 °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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