Cape Northumberland Weather Forecast

    • 12
    • 22

    Shower

    • 9
    • 14

    Partly cloudy

    • 1
    • 16

    Partly cloudy

    • 4
    • 20

    Partly cloudy

    • 10
    • 23

    Cloudy

    • 13
    • 21

    Shower

    • 12
    • 16

    Shower

Today 20 Sep Lower South East

Cloudy. High chance of showers in the south, medium chance elsewhere. Winds westerly 30 to 45 km/h decreasing to 25 to 35 km/h in the late afternoon then tending southwesterly 20 to 30 km/h in the late evening.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
Westerly 20 to 25 knots, reaching up to 30 knots south of Beachport during the afternoon and evening. Winds turning southwesterly in the evening.
Seas
2 to 2.5 metres.
1st Swell
West to southwesterly 2.5 to 3 metres.
Weather
Cloudy. 50% chance of showers.
Weather Situation
A trough and cold front will move to the east of SA later Sunday. A high pressure system will move eastwards across waters to the south during Monday then over Victoria and the Tasman Sea on Tuesday. This high will extend a ridge westwards over SA ahead of a low pressure trough that is expected to move over the far west of SA during Wednesday. The trough will slip southeastwards over the Bight during Thursday.
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 8 September, 2026

    0.3 °C

  • Average September

    11.5 °C

  • Highest 18 September, 2026

    22.2 °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

    20.1 °C
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