Cape Northumberland Weather Forecast

    • 3
    • 17

    Partly cloudy

    • 7
    • 22

    Partly cloudy

    • 12
    • 19

    Shower

    • 11
    • 17

    Shower

    • 10
    • 14

    Shower

    • 8
    • 14

    Cloudy

    • 6
    • 16

    Partly cloudy

Today 11 Sep Lower South East

Sunny. Light winds. Daytime maximum temperatures around 19.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
Easterly 10 to 15 knots decreasing to about 10 knots in the late evening.
Seas
Below 1 metre.
1st Swell
Southwesterly 4 metres.
Weather
Mostly clear.
Weather Situation
A high pressure system east of SA extends a ridge across much of the state, as a low pressure trough over the interior of WA weakens overnight. Another trough will approach from the west late on Saturday, move across SA on Sunday with a ridge then extending into the state from a high located southwest of WA. An upper level disturbance will move over the far west on Monday, and a cold front will slip across southern coasts later in the day and early Tuesday. The high will then move across waters to the south throughout the week.
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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

    10.8 °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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