Cape Northumberland Weather Forecast
- 11
- 17
Shower
- 10
- 14
Shower
- 9
- 14
Cloudy
- 6
- 15
Cloudy
- 5
- 21
Sunny
- 11
- 23
Partly cloudy
- 12
- 17
Shower
Today 14 Sep Lower South East
Cloudy. High chance of showers, most likely this evening. Winds westerly 15 to 25 km/h increasing to 20 to 30 km/h in the middle of the day then tending southwesterly 15 to 25 km/h in the late evening. Daytime maximum temperatures around 17.
Lower South East Coastal Waters
Cape Jaffa to SA-Vic Border- Wind
- Westerly 15 to 20 knots turning southwesterly in the evening.
- Seas
- Around 1 metre, increasing to 1 to 1.5 metres around midday.
- 1st Swell
- Southwesterly 2 metres, tending westerly 2 to 2.5 metres by early evening.
- Weather
- Cloudy. 70% chance of showers.
- Weather Situation
- A high pressure ridge builds across much of SA, as a cold front slips across southern coasts late today into early Tuesday. A high pressure system will then move across waters to the south throughout the week to be centred over Victoria by Thursday. A low pressure trough in the interior of WA may extend into far western parts at times before weakening by late Tuesday.
Cape Northumberland Temperature Statistics View More
September Temperature
Mount Gambier Airport (36km)
Lowest 8 September, 2026
0.3 °CAverage September
11.5 °CHighest 12 September, 2026
21.8 °C
Climate (2021–2026)
Mount Gambier Airport (36km)
Average Low 2021–2026
8.9 °CAverage 2021–2026
13.7 °CAverage High 2021–2026
20 °C