Cape Northumberland Weather Forecast

    • 12
    • 22

    Shower

    • 9
    • 14

    Partly cloudy

    • 1
    • 16

    Partly cloudy

    • 4
    • 20

    Sunny

    • 11
    • 22

    Cloudy

    • 13
    • 21

    Shower

    • 12
    • 18

    Shower

Today 20 Sep Lower South East

Becoming cloudy. High chance of showers in the south, medium chance elsewhere. Winds northerly 20 to 30 km/h increasing to 30 to 45 km/h in the early morning then shifting west to southwesterly 20 to 30 km/h in the afternoon. Overnight temperatures falling to around 11 with daytime temperatures reaching the low 20s.

Lower South East Coastal Waters

Cape Jaffa to SA-Vic Border
Wind
North to northwesterly 20 to 30 knots turning west to southwesterly in the afternoon.
Seas
1 to 1.5 metres, increasing to 2 to 2.5 metres during the morning.
1st Swell
Southwesterly 2 metres, increasing to 2 to 3 metres during the morning, then tending west to southwesterly 3 to 4 metres later in the evening.
Weather
Partly cloudy. 50% chance of showers.
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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