Cape Northumberland Weather Forecast

    • 14
    • 21

    Shower

    • 11
    • 17

    Shower

    • 10
    • 16

    Shower

    • 9
    • 16

    Partly cloudy

    • 8
    • 16

    Cloudy

    • 6
    • 18

    Shower

    • 9
    • 15

    Shower

Today 30 Sep Lower South East

Cloudy. Very high chance of showers. The chance of a thunderstorm late this afternoon and evening. Light winds becoming northwesterly 15 to 20 km/h in the middle of the day then becoming light in the late afternoon. Daytime maximum temperatures in the low 20s.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
West to northwesterly about 10 knots.
Seas
Below 1 metre.
1st Swell
Southwesterly 2.5 metres.
Weather
Cloudy. 95% chance of showers. The chance of a thunderstorm late this afternoon and evening.
Weather Situation
A series of slow moving troughs will move across the state today and Thursday as a couple of cold fronts move across waters to the south. A high pressure system will become established south of the Bight during Friday and persist there on Saturday. A trough will extend from WA over the far west of SA over the weekend.
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 22 September, 2026

    -0.3 °C

  • Average September

    11.9 °C

  • Highest 19 September, 2026

    25.8 °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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