Cape Northumberland Weather Forecast

    • 8
    • 15

    Partly cloudy

    • 6
    • 20

    Windy

    • 10
    • 17

    Shower

    • 7
    • 14

    Shower

    • 10
    • 16

    Shower

    • 8
    • 15

    Shower

    • 8
    • 16

    Shower

Today 17 Sep Lower South East

Partly cloudy. Slight chance of a shower during the morning and afternoon. Winds westerly 20 to 30 km/h becoming light in the late afternoon. Daytime maximum temperatures around 15.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
Westerly 15 to 20 knots turning northwesterly in the late afternoon.
Seas
1 to 2 metres, decreasing below 1.5 metres by early evening.
1st Swell
Westerly 5 metres, tending southwesterly 4 to 5 metres during the afternoon.
Weather
Partly cloudy.
Weather Situation
A high pressure system over the state will move east tonight to be over NSW Thursday morning. A weak trough will move over South Australian waters on Thursday. A cold front will pass over the south on Friday followed by a southwesterly flow that is expected to persist through the weekend owing to a ridge of high pressure extending over northern parts of the state.
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 5 September, 2025

    -0.2 °C

  • Average September

    11.5 °C

  • Highest 15 September, 2025

    25.2 °C

Climate (2020–Present)

Mount Gambier Airport (36km)

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  • Average Low 2020–2025

    8.8 °C

  • Average 2020–2025

    13.7 °C

  • Average High 2020–2025

    20 °C
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